Email Deliverability Checklist for 2026: The AI-Era Inbox

Email Deliverability Checklist for 2026: The AI-Era Inbox

Email deliverability is a critical so your campaign actually reaches the inbox instead of landing in Spam folder or the Promotions tab. In 2026, three things decide it: authentication (proving you are who you say you are), sender reputation (your track record with mailbox providers), and engagement (whether real people open, click, and reply). This email deliverability checklist walks through all six fundamentals and what’s changed now that AI summarizes the inbox.

Most deliverability advice still treats the inbox like it’s 2023.  Many marketers chase the open rate, keep your list clean, and you’re fine. That world is gone. Gmail, Yahoo, and Microsoft now reject mail that fails authentication, open rate is no longer a reliable signal, and AI is starting to summarize your emails before a human ever reads them. The fundamentals below still decide whether you reach the inbox but several of them now work differently.

Run the first five sections against your process, and add the Pre-Send Check to every deployment.  You can download a PDF for easy access and/or reference in the future here.

You can also read our short but comprehensive article for additional background and guidance. “How AI Is Changing the Way You Need to Build Emails to Reach the Inbox”

Guide and Email Deliverability Checklist

1. Authentication

❑  SPF is published and passing for your sending domain

❑  DKIM is enabled and signing your mail

❑  DMARC is published and aligned with SPF and/or DKIM

Why it matters: SPF, DKIM, and DMARC are the three records that prove your email genuinely came from your domain and wasn’t spoofed. Gmail, Yahoo, and Microsoft now reject (not just filter) unauthenticated mail from higher-volume senders. If these fail, the campaign never arrives.

2. Sender Reputation

❑  DMARC monitoring is in place and reviewed regularly

❑  Spam-complaint rate is tracked and held under 0.10% (and never approaching 0.30%)

❑  Sending volume is consistent.  No sudden spikes from a cold domain or IP

Why it matters: Reputation behaves like a credit score. It is slow to build and quick to damage. It still decides Primary Inbox vs. Promotions tab vs. Spam. Mailbox providers want your spam-complaint rate under 0.10%; crossing 0.30% or you can land you in the spam folder for everyone.

3. Engagement

❑  Primary KPIs are clicks, conversions, and replies. Not just open rate alone

❑  Engagement is reviewed by audience segment, not just program-wide averages

❑  A re-engagement or sunset flow exists for declining subscribers

Why it matters: Mailbox providers place mail based on real engagement, so engagement is now a deliverability signal. It is no longer just a performance metric. Open rates have become unreliable because of privacy protections (like Apple Mail Privacy Protection) and AI inbox behavior that can pre-load or auto-open messages.

4. List Quality

❑  Invalid and bounced addresses are removed on a regular cadence

❑  Chronically unengaged contacts are suppressed or sunset

❑  Lists are segmented by real activity, not just by static fields

Why it matters: Mailing inactive or invalid contacts drags down deliverability for your entire list. This includes the subscribers who genuinely want to hear from you. Clean, activity-based segmentation can help to protect your engaged and core of your audience. Quality vs. Quantity is now a real strategic consideration.

5. Designing for the AI Inbox

❑  Emails are written so the core message survives being summarized to one or two lines

❑  The single most important call to action is unmistakable, not buried among several links

❑  Plain-text and accessible structure are prioritized so AI assistants can parse the content accurately

❑  Performance is reviewed with the assumption that open rate will keep degrading as a metric

Why it matters: Gmail, Outlook, and Apple are putting AI between your email and your reader. Increasingly, an assistant reads the message first and tells the human what it says. If your email only makes sense when read top to bottom by a person, it loses meaning the moment it’s summarized. Writing for the AI inbox is quickly becoming part of writing for deliverability.

6. Pre-Send Check (run on every deployment)

❑  Subject line stands on its own and leads with the email’s primary value

❑  The key message lands in the first few sentences

❑  Real text is used instead of text embedded in images, with alt text in place

❑  A clean preheader is set. The top isn’t stuffed with legal text, nav, or “view online” links

❑  Semantic structure is used: headings, short paragraphs, a scannable layout

❑  The AI-summary preview is reviewed to confirm an AI-generated summary would represent the message well

Why it matters: AI-generated inbox summaries can now replace your preview text, and AI decides which content matters most. Clear structure and a strong, self-contained subject line are what carry the message through.

 

Some Additional Email Deliverability FAQs and Tips

What is a good spam complaint rate for email?

Mailbox providers want your spam-complaint rate held under 0.10%. Crossing 0.30% is treated as a serious problem and can push your mail to the spam folder for your entire list, not just the people who complained.

Do Gmail, Yahoo, and Microsoft reject unauthenticated email?

Yes. For higher-volume senders, Gmail, Yahoo, and Microsoft now reject mail that fails authentication rather than simply filtering it. That’s why SPF, DKIM, and DMARC are no longer optional. Without them, the campaign never arrives.

Why are open rates unreliable in 2026?

Privacy protections like Apple Mail Privacy Protection and AI inbox behavior can pre-load or auto-open messages, which inflates and distorts open data. That’s why clicks, conversions, and replies are now the KPIs that matter, and why engagement (not opens) is the signal mailbox providers use to place your mail.

How do AI inbox summaries affect email marketing?

AI assistants in Gmail, Outlook, and Apple Mail can generate a short summary of your email and even replace your preview text. The practical effect is that an AI often reads your message before a human does. Emails with a clear subject line, a key message up front, and clean semantic structure summarize well; cluttered emails get misrepresented.

What’s the fastest way to improve email deliverability?

Start with authentication (SPF, DKIM, DMARC), because failing it stops delivery entirely. Then protect sender reputation by keeping complaint rates low and volume steady, and clean your list so you’re not mailing invalid or chronically unengaged contacts that drag down everyone else.

Streamline email deliverability in Salesforce, Marketing Cloud Account Engagement, Sales Cloud and/or Marketing Cloud Next

Knowing the checklist is one thing; operationalizing B2B deliverability inside Salesforce Marketing Cloud, Account Engagement (formerly Pardot), Marketing Cloud Next or Sales Cloud so authentication, suppression, and engagement-based segmentation run reliably every send can be daunting. That’s just some of the work Gabriel Sales does for B2B teams every day. See how we’ve helped clients tighten their marketing and sales operations in multiple ways in our case studies, or contact us to schedule some time to learn a little bit more about how we may be able to help.

Further reading

“How AI Is Changing the Way You Need to Build Emails to Reach the Inbox”

 

Additional Educational Resources

How to Create a Lead Nurturing Workflow

How to Create a Lead Nurturing Workflow

Targeted Marketing and Ideal Customer Profiles Improve Campaigns

Creating a Lead Nurturing Workflow

Creating an awesome lead nurturing workflow involves careful planning, personalized content, and continuous optimization. By having a deeper understanding of your customer, you are better positioned to identify their specific needs, or pain points. By providing helpful and personalized content at each point in sales cycle, you earn the opportunity to engage a sales lead and nurture them further into the funnel towards that delightful moment when they become a customer.

Only a very small percentage of potential customers who seek out information about your product or service are ready to buy when they start their sales journey. The others need to be educated and listened to, and their wants need to be assessed at various points once they enter the sales funnel. Just like any other relationship, they need to be nurtured from interested party in order to convert to valued client.

Lead nurturing at its simplest means taking an interested party and building that relationship so that someone who was not ready to buy at the beginning of their sales journey becomes someone ready to pull the trigger and become a satisfied customer.

Define Your Goals: Clearly outline your objectives for the lead nurturing workflow. Identify your target audience segments based on their interests, behaviors, and stage in the buyer’s journey. You’ll need to consider how each customer is different, and work to find commonalities among both existing customers and potential ones. Demographics are one powerful segmentation tool; gender, company position, age, income level and geographical location are all attributes that you can take into account as you create content. Certain industries gravitate to approaches driven by SMS or social media, while others rely on more traditional email communication. Statistics derived from those emails are already likely a crucial part of how you track leads; similarly, the ways in which your potential customers interact with your website should be a key in determining what kind of content you provide them with as you lead them through your funnel.

Once you know your goals and outcomes, start building a lead nurturing workflow with these key considerations.

  1. Understand Your Buyer’s Journey: Map out the stages of your buyer’s journey and the content needs at each stage. Tailor your lead nurturing content to align with the needs of leads as they progress through the funnel.
  2. Segment Your Leads: Segment your leads based on their demographics, interests, past interactions, and behavior. This will enable you to deliver personalized content that resonates with each segment.
  3. Create Valuable and Relevant Content: Develop high-quality content that educates, informs, and addresses the pain points of your leads. Offer a mix of content types, such as blog posts, e-books, webinars, case studies, and videos.
  4. Automate Your Workflow: Utilize a marketing automation platform to set up the lead nurturing workflow. Automate the delivery of content and trigger actions based on lead behavior or engagement.
  5. Start with a Welcome Email: The first email in your workflow should be a warm and engaging welcome message. Thank the lead for their interest and set expectations for future communications.
  6. Personalize Your Content: Use the data you have collected to personalize your emails and content for each lead segment. Address leads by their names and tailor the content to their specific interests.
  7. Use Behavioral Triggers: Set up behavioral triggers to send specific content based on lead actions, such as website visits, content downloads, or email clicks.
  8. Progressive Profiling: Gradually collect additional information from leads over time using progressive profiling. Use the data to further personalize your interactions.
  9. Include Calls-to-Action (CTAs): Encourage engagement and further interactions with your content by including relevant CTAs that direct leads to the next stage in the buyer’s journey.
  10. Lead Scoring and Grading: Implement lead scoring and grading to identify highly engaged and qualified leads. Prioritize your follow-up efforts based on lead scores.
  11. Test and Optimize: Continuously test different elements of your lead nurturing workflow, such as subject lines, content, and send times. Analyze the results and make data-driven improvements.
  12. Align Marketing and Sales: Foster collaboration between your marketing and sales teams. Share insights and feedback to ensure a seamless transition of leads from marketing to sales.
  13. Measure and Track Results: Monitor the performance of your lead nurturing workflow using key metrics such as open rates, click-through rates, conversion rates, and lead-to-customer conversion.
  14. Iterate and Improve: Based on the data and insights, make necessary adjustments and improvements to your lead nurturing workflow to enhance its effectiveness continually.

Remember that an effective lead nurturing workflow is customer-centric, personalized, and focuses on building trust and relationships with your leads. By providing valuable content, addressing their needs, and engaging with them at the right time, you can guide leads through the buyer’s journey and increase the likelihood of converting them into loyal customers.

 

 

What is a lead nurturing workflow?

What is a lead nurturing workflow?

What is a lead nurturing workflow work and how does it work?

Consider the ways in which we encounter the word nurture. It’s generally used to describe relationships where a person is entrusted with the role of caregiver. A parent nurtures their child, a teacher nurtures a student, a mentor nurtures us as we pursue a career or a deep personal interest. That concept of the interpersonal relationship is at the center of building and deploying a lead nurturing workflow. So what is a lead nurturing workflow for B2B marketers?

A lead nurturing workflow is a series of automated marketing actions and communications designed to engage and build relationships with leads over time. The goal of a lead nurturing workflow is to keep leads engaged, provide relevant and valuable content, and move them through the buyer’s journey until they are ready to make a purchase decision. With the tools of automation, marketing software helps us deliver a sales prospect an abundance of content that is both customized to their needs, and perhaps more importantly, can be personalized to either the organization or the individual decision makers. Either way, the strategy is a way that we begin to build a relationship with a prospect in the sales funnel and then nurture it as they turn from prospect to qualified lead to customer.

Lead nurturing workflows are typically implemented through marketing automation platforms. These platforms allow marketers to deliver targeted and personalized content to leads based on their behaviors, interests, and stage in the buyer’s journey.

You might engage a prospect with a landing page specific to their interests; that might be paired with another typical building block of inbound marketing, a content offer. Content offers, often referred to as lead magnets, offer prospects some sort of enticement—a discount offer, or perhaps some gated content such as a free download—in exchange for their email address. Whatever your choice of magnet, it’s an important part of beginning to nurture the prospect into your sales funnel. Instead of the old school closer, your role is as a valued partner and educator, guiding the buyer to a purchase decision. Typically, much of that guidance is provided through the use of targeted and personalized emails, which are an important part of your workflow.

There are several marketing automation platforms available that can help you build and execute marketing workflows effectively. These platforms offer various features, integrations, and pricing options to suit the needs of different businesses.

HubSpot is a comprehensive inbound marketing and sales platform that offers a powerful marketing automation tool. It allows you to create and manage marketing workflows, segment leads, deliver personalized content, and track engagement. HubSpot also provides CRM integration, making it easy to align marketing and sales efforts.

Pardot, a Salesforce product, is a B2B marketing automation platform that helps businesses automate lead nurturing, email marketing, and lead scoring. It integrates seamlessly with Salesforce CRM, making it suitable for businesses heavily reliant on Salesforce.

Marketo is a popular marketing automation platform that offers lead management, email marketing, campaign management, and reporting capabilities. It caters to B2B and B2C businesses and provides advanced features for lead nurturing and engagement.

ActiveCampaign is a versatile marketing automation platform that offers a user-friendly interface and robust automation capabilities. It allows you to create automation workflows based on various triggers and actions and provides CRM and email marketing functionalities.

Whatever tools you choose, each step of the buyer’s journey needs specialized content to move your buyer from their initial awareness of a problem to their investment in your product or service as a solution.

Here’s how a lead nurturing workflow generally works

  1. Segmentation: Leads are segmented based on their characteristics, interests, and behaviors. This segmentation allows marketers to create tailored content and messages for each group of leads.
  2. Lead Capture: Leads are captured through various channels such as landing pages, website forms, content downloads, or events.
  3. Automated Triggers: Once a lead enters the nurturing workflow, automated triggers are set up to initiate the sequence of communications. These triggers can be based on actions like form submissions, content downloads, email opens, or website visits.
  4. Welcome Email: The first communication in the nurturing workflow is often a welcome email. This email thanks the lead for their interest and sets the tone for further interactions.
  5. Content Delivery: Over the course of the workflow, leads receive a series of targeted and relevant content, such as blog posts, e-books, whitepapers, videos, webinars, and case studies. The content is designed to educate, address pain points, and provide value to the lead.
  6. Lead Scoring: As leads engage with the content and interact with the emails, their level of engagement is tracked through lead scoring. Lead scoring assigns values to different actions, helping marketers identify the most engaged and qualified leads.
  7. Progression: As leads continue to interact with the content and move further along the buyer’s journey, the nurturing workflow can adapt and provide more advanced and targeted content.
  8. Sales Handoff: When a lead reaches a certain level of engagement and meets specific criteria, they are deemed “sales-ready” and can be handed off to the sales team for further follow-up and conversion.
  9. Continuous Nurturing: For leads that are not yet ready to make a purchase, the nurturing workflow continues to provide relevant content and maintain engagement until they reach the decision stage.
  10. Measure and Optimize: Throughout the lead nurturing process, marketers continuously measure the performance of the workflow. They analyze open rates, click-through rates, conversion rates, and other metrics to optimize the content and timing for better results.

Lead nurturing workflows play a critical role in building relationships with potential customers, keeping the brand top-of-mind, and guiding leads towards making informed purchase decisions. By providing personalized and valuable content at the right time, businesses can increase the likelihood of converting leads into loyal customers.

 

How to Move Prospects Through B2B Sales Funnel

How to Move Prospects Through B2B Sales Funnel

How to Move Prospects Through the B2B Sales Funnel

Moving Prospects Through Your B2B Sales Funnel

Now that we understand that we can educate prospects to become buyers, we need a clear and consistent strategy to move prospects through the B2B sales funnel from the Awareness stage and convert them into a new, high-volume customer. It’s important to remember too that your business is not the only one making this adaptation; a quick Google search for a simple term like “digital marketing” will generate hundreds of millions of possible hits.

Your ideal customer needs to feel that their needs are understood in order to make a purchase decision, and similarly, you need to have a comprehensive understanding of your own company and the value it offers. And when your organization has a fully aligned sales and marketing approach, you’ll have that same understanding of your customer base.

When these qualities are determined by data, you have a great opportunity to capture a lead and move it through your sales funnel to successful conversion.

A lead nurturing workflow—a series of automated marketing actions and communications designed to engage and nurture leads over time—builds relationships with potential customers and guides them through the buyer’s journey. This typically involves sending a sequence of targeted and relevant content to leads based on their interests, behaviors, and stage in the buyer’s journey. The content is delivered through automated emails, triggered by specific actions or time-based intervals. The workflow aims to keep leads engaged, provide value, and address their needs and concerns throughout their decision-making process.

You’ll need to use progressive profiling to gradually gather additional information about leads over time. Instead of asking for a large amount of information upfront on a lead capture form, progressive profiling allows marketers to collect data in a more gradual and non-intrusive manner.

Every one of us as a customer has abandoned research into a product when our information gathering is slowed by an overly intrusive or large lead capture form. Progressive profiling allows you to build a profile of your lead over time as they interact with various content. The marketing automation system then tracks the lead’s interactions, behavior, and engagement with the website and marketing content.

As the lead continues to interact with the website or engage with marketing content, subsequent forms presented to the lead are dynamically updated based on the information already collected. The form fields are adjusted to ask for new information that has not been previously provided.

Each time the lead encounters a new form, they are asked for one or a few additional pieces of information. This approach reduces form fatigue and makes it more likely that the lead will provide the requested information.

The additional data collected through progressive profiling allows marketers to personalize their communications and segment leads based on their interests, behaviors, and preferences.

And while you are obviously familiar with the need for tracking standard content reporting metrics like page views or conversion rates, these progressive practices will allow you to observe where a prospect drops out of the sales funnel. Armed with that information, you can adjust your marketing efforts and strategies to easily micro-tune your approach so that it is better aligned with your ideal customer profile.

Basic outline steps that help effectively move prospects through the B2B sales funnel

  1. Define your target audience: Clearly identify your ideal customer profile (ICP) and understand the characteristics of the companies or individuals who are most likely to benefit from your B2B offerings.
  2. Generate awareness: Use content marketing, social media, email marketing, webinars, and industry events to create awareness about your brand and solutions. Provide valuable content that addresses the pain points and challenges of your target audience.
  3. Capture leads: Offer gated content, such as e-books, whitepapers, or industry reports, in exchange for contact information. This helps you capture leads and build your email list for further engagement.
  4. Nurture leads with relevant content: Utilize targeted email campaigns and marketing automation to nurture leads with personalized content. Send them industry insights, case studies, success stories, and educational content to keep them engaged and informed.
  5. Qualify leads: Implement lead scoring to identify and prioritize the most qualified prospects. Assess their level of interest, engagement, and fit with your ICP to focus your efforts on the most promising opportunities.
  6. Personalize the sales approach: As prospects move further down the funnel, personalize your sales approach based on their specific needs and pain points. Conduct thorough research to understand their business challenges and demonstrate how your solutions can address them.
  7. Arrange meetings or product demonstrations: Offer one-on-one meetings, product demonstrations, or personalized consultations to showcase the value of your B2B offerings. Tailor these interactions to address the prospects’ unique requirements.
  8. Address objections and concerns: Be prepared to address any objections or concerns that prospects may have. Provide relevant information and evidence to instill confidence in your solutions.
  9. Offer trial periods or pilot projects: For more complex B2B solutions, consider offering trial periods or pilot projects to allow prospects to experience the benefits firsthand before committing to a full purchase.
  10. Present case studies and testimonials: Share success stories, case studies, and customer testimonials that highlight the positive outcomes experienced by other clients. This social proof can build trust and credibility.
  11. Negotiate and close the deal: As prospects become more interested and committed, negotiate the terms and conditions, pricing, and contract details. Address any final concerns before closing the deal.
  12. Provide exceptional post-sales support: After the sale, continue to provide excellent customer service and support. This builds customer loyalty and increases the chances of repeat business or referrals.

Throughout the B2B sales funnel, communication and collaboration between your marketing and sales teams are essential. By aligning marketing efforts with sales strategies, you can create a seamless and effective experience for your prospects, increasing the likelihood of converting them into long-term, satisfied customers.

 

How to Run an Account Based Marketing Campaign

How to Run an Account Based Marketing Campaign

Account Based Marketing Campaign

Run an Account Based Marketing Campaign Successfully

Account-based Marketing (ABM) can be a very effective way to reach your target accounts and generate leads. But it is not an appropriate solution for selling to all possible customers. Typically, you will need information from your existing sales and marketing programs to determine which existing customers are of the highest value, and which potential customers are worth the intensive investment of resources that a successful ABM program requires.

ABM works best when you can target a higher-value segment of your market. High volume, low value sales aren’t ideal for an ABM campaign. At the simplest level, in an ABM campaign, the pre-qualification you do for each potential new customer leads to an increase in profitability, because your customers have been pre-vetted as qualified. Similarly, because you have targeted an audience with a higher budget, a successful campaign means sales with a larger annual contract value (ACV). Since the cost of doing business remains roughly the same, your profitability increases by serving these potentially higher-value clients.

Those higher-value clients are found by writing and refining an ideal customer profile (ICP) that moves over the course of your work from identifying a theoretical ideal customer to identifying real businesses that could potentially benefit from investing in your product or service.

Those named-account targets can be found by examining data you should already have on hand in your customer relationship management solution (CRM). You’ll want to examine the metrics of each of your existing customers, and then do the same for your theoretical ideal customers. With your existing customers, the focus is on trying to identify which qualities of a customer make them more valuable. Are you selling to customers only of a certain size, a certain number of employees, or with a certain annual revenue? Are your deals concentrated in specific geographic areas? Are they triggered by events, such as a change in senior leadership, a change in industry trends, current events, or even changes in the company’s financial standing, such as a missed earnings target, a new stock offering, or a recent bankruptcy?

Once you have a deeper understanding of your customer, you’ll use that information to add to your portrait of an ideal customer. Using your newly developed ICP, you’ll have targeted sales prospects for your ABM campaign.

Running a successful account based marketing campaign requires a strategic approach and effective execution. ABM is a collaborative effort between marketing and sales. You need to involve sales early in the process so that they can provide input on the target accounts and help to close deals. The key to ABM is personalization. You need to create messages that are tailored to the specific needs and interests of your target accounts. You shouldn’t rely on just one channel to reach your target accounts. You need to use a variety of channels, such as email, social media, and direct mail. And because your ABM campaign is literally born out of data, it’s imperative to track the results of your ABM campaign so that you can make necessary adjustments to both your marketing campaigns and your ideal customer profile.

Here’s a step-by-step guide to help you run an Account Based Marketing campaign

  1. Define your ICP: Begin by clearly defining your target accounts based on your Ideal Customer Profile. Identify the characteristics and criteria that make a company a good fit for your products or services.
  2. Identify target accounts: Based on your ICP, create a list of high-value target accounts that align with your business objectives and have the potential for significant impact.
  3. Research and gather insights: Conduct thorough research on each target account to understand their specific needs, challenges, goals, and key decision-makers. Gather insights from both internal sources (e.g., sales teams, customer support) and external data providers.
  4. Develop personalized content: Create tailored and relevant content that addresses the pain points and objectives of each target account. This could include customized blog posts, case studies, whitepapers, videos, or other formats.
  5. Choose appropriate marketing channels: Select channels that are most effective for reaching your target accounts. This may include email marketing, social media, direct mail, webinars, events, and one-on-one interactions like phone calls or in-person meetings. Different customers require different approaches based on their demographics.
  6. Coordinate sales and marketing efforts: Alignment between your sales and marketing teams is crucial for ABM success. Collaborate with your sales team to develop account-specific strategies and messaging.
  7. Personalize outreach and engagement: Craft personalized messages for each key decision-maker within the target account. Address their specific needs and pain points to demonstrate that you understand their challenges.
  8. Implement automation and technology: Use marketing automation tools to scale your ABM efforts efficiently. Automation can help with content distribution, lead tracking, and personalized follow-ups.
  9. Measure, Analyze, Optimize and Iterate: Track key performance indicators (KPIs) specific to your ABM campaign, such as engagement rates, conversion rates, pipeline progression, and revenue generated from target accounts. Analyze the data to assess the effectiveness of your campaign and make data-driven adjustments. Continuously review the performance of your ABM campaign and optimize your strategies based on the insights gained. ABM is an iterative process, and ongoing improvements will lead to more effective targeting and engagement.
  10. Focus on long-term relationships: ABM is not a one-time effort; it’s about building lasting relationships with key accounts. Nurture these relationships with personalized attention and ongoing support.

Remember that ABM is a targeted and personalized approach, so it may involve fewer accounts than traditional marketing efforts. However, the high level of engagement and personalized attention can lead to stronger connections, increased customer loyalty, and higher ROI from your most valuable customers.