Your email deliverability depends on how engaged your contacts are — and how well you manage the ones who stop engaging. This article explains what email engagement means, how it affects your ability to reach the inbox, and what actions to take to maintain a healthy sending reputation. It also covers Keap™'s 18-month engagement policy, which went into effect on January 30, 2026, and the volume-based strategy for managing unengaged contacts before they become a deliverability risk.
What Is Email Engagement?
Email engagement refers to how actively your contacts interact with your emails. Engagement is measured by tracking actions like opens, clicks, and form submissions — and by calculating how recently those actions occurred. In your CRM, engagement is expressed as the number of days since a contact last opened or clicked an email sent from the Keap™ email network.
Engagement is one of the most important signals mailbox providers — such as Gmail, Outlook, and Yahoo — use to decide whether your emails land in the inbox, get filtered to spam, or are blocked entirely. A contact list with strong engagement signals tells inbox providers that your recipients want your emails. A list with poor engagement signals the opposite.
Types of Engagement — Positive and Negative
Positive engagement signals that a contact finds value in your emails and helps boost your sender reputation. Positive engagement actions include:
Opening your emails
Clicking on links inside your emails
Moving your email from the spam or junk folder to the inbox
Negative engagement signals that a contact is not finding value in your emails and warns mailbox providers to treat your future sends with more scrutiny. Negative engagement actions include:
Unsubscribing from your emails
Marking your email as spam
Deleting your email without opening it
Leaving your email in the spam or junk folder without moving it to the inbox
Why Engagement Matters for Deliverability
Sending marketing emails to unengaged or uninterested contacts does not just waste a send — it actively harms your ability to reach every contact on your list, including the ones who do want your emails. Sending to unengaged contacts can produce the following consequences:
Lower open and click rates across all of your campaigns
Increased risk of hitting spam traps — email addresses used by inbox providers or third-party monitors to detect poor list hygiene
Damage to your sender reputation with major mailbox providers
Emails landing in spam folders or being blocked entirely for all recipients at a given provider — not just the unengaged contacts
Key Factors That Influence Engagement
Several factors determine how actively your contacts interact with your emails. Review each area below to identify where your email program may need improvement:
Content quality — Is the email content valuable, relevant to the recipient, and easy to read? Content that does not match what the contact signed up for drives disengagement.
Subject lines — Are your subject lines attention-grabbing, clear, and aligned with the actual content of the email? Misleading or weak subject lines reduce open rates.
Email design — Is the email mobile-friendly, visually appealing, and easy to navigate? Emails that render poorly on mobile devices see significantly lower engagement.
Send frequency — Are you emailing too often, causing fatigue, or too infrequently, allowing contacts to forget who you are? Both extremes lead to disengagement and opt-outs.
How Your CRM Email Differs from Personal Email
Emails sent through your CRM are treated differently from personal one-to-one emails. Your CRM operates as an Email Service Provider (ESP) — a platform recognized by inbox providers such as Gmail and Outlook as a bulk sender. Because ESPs send large volumes of email, inbox providers apply stricter filtering standards and require higher engagement signals before routing messages to the inbox.
This means that poor engagement in your CRM campaigns does not just affect individual messages — it affects your sender reputation at the ESP level, which impacts the inbox placement of all future sends across your entire contact list. Maintaining high engagement is not optional for bulk senders — it is a requirement for reliable inbox delivery.
Keap™'s 18-Month Engagement Policy
As of January 30, 2026, Keap™ restricts email sending to contacts who have been inactive for 18 months or longer. This policy is in effect now and applies to all accounts. Contacts who have not opened or clicked an email in 18 months or more will not receive marketing emails sent through your CRM until their engagement status is updated.
This policy exists to protect the deliverability and sender reputation of the entire Keap™ sending network. To stay compliant, review and manage unengaged contacts on a regular basis using the volume-based strategy described in the next section. Proactive list management prevents contacts from reaching the 18-month inactivity threshold in the first place.
Managing Unengaged Contacts — Volume-Based Strategy
How you handle unengaged contacts should be based on how often you email them — not just how long ago they opted in. The following lifecycle strategy is based on the number of emails sent to a contact without a positive engagement response. Apply this strategy to any contact who has not opened or clicked after receiving the emails at each stage.
Emails 1–4: Send regular marketing content. Monitor engagement after each send.
Emails 5–6: Send re-engagement messages specifically designed to reactivate the contact's interest.
Emails 7–8: Send double opt-in confirmation emails to ask the contact to actively confirm they want to continue receiving your emails.
No confirmation within 10 days of Email 8: Opt the contact out and stop sending marketing email to that contact. Do not continue sending in the hope that future emails will re-engage them.
Low frequency exception: If you send only one email per month to a contact, use calendar months rather than email count to time your re-engagement and double opt-in steps. Apply the same sequence but space each stage one month apart rather than by email number.
The chart above shows the recommended contact lifecycle by email count for contacts who have not engaged. The four stages progress from regular marketing content at emails 1–4, to re-engagement messages at emails 5–6, to double opt-in confirmation at emails 7–8, to opting the contact out if no confirmation is received within 10 days of the eighth email. The chart does not show a path back into the active send list — a contact who does not confirm at email 7–8 should be opted out and removed from marketing sends.
Email Compliance — The Three Pillars of Success
Long-term email deliverability depends on three areas working together. A weakness in any one of these areas will negatively affect the other two.
List quality. Only send to contacts who expect and want your emails. Engagement is the proof of interest. Contacts who have not engaged within 90 days should be moved into a re-engagement workflow rather than continuing to receive regular marketing sends.
Content quality. Every message you send should be relevant, on-brand, and free of spam-like formatting, phrases, or HTML structures. Poor content causes opt-outs, spam complaints, and disengagement — all of which damage your sender reputation.
Send frequency. Sending too many emails — even with great content — leads to fatigue and opt-outs. Sending too infrequently allows contacts to forget who you are and increases the likelihood they will mark your emails as spam when they do arrive. Find the right cadence for your audience and maintain it consistently.
What to Do Now
To bring your email program into compliance with the 18-month engagement policy and maintain strong deliverability, complete the following steps:
Track your average number of emails sent per contact per month to understand where each contact falls in the volume-based lifecycle strategy above.
Implement the re-engagement timeline into your email strategy so that unengaged contacts are automatically moved through the re-engagement and double opt-in stages before reaching the 18-month inactivity threshold.
Suppress or opt out any contacts who do not confirm continued interest after the double opt-in window closes. Do not continue sending to these contacts.
Review your list now for contacts who have already been inactive for 12 months or more and begin the re-engagement process immediately to avoid them hitting the 18-month threshold.
Glossary of Key Terms
Engagement — The number of days since a contact last opened or clicked an email, filled out a form, or completed a purchase. Used to determine whether a contact is active or unengaged.
Bounce rate — The percentage of emails rejected by inbox providers. Formula: Bounced emails divided by total emails sent.
Deliverability — The percentage of emails accepted by inbox providers and delivered to the recipient's mailbox. Formula: Sent minus bounced, divided by total sent.
Open rate — The percentage of recipients who opened your email. Formula: Opened divided by sent minus bounced.
Click rate — The percentage of recipients who clicked a link in your email. Formula: Clicked divided by sent minus bounced.
Blocklist — A list of domains or IP addresses flagged for spammy behavior. Being listed on a blocklist reduces or blocks your email delivery across the providers that reference that list.
Spam trap — An email address used by inbox providers or third-party monitoring organizations to detect poor list hygiene. Sending to a spam trap signals that your list was not built with proper opt-in practices.
Email Service Provider (ESP) — A platform used to send bulk email campaigns. ESPs are recognized by inbox providers as bulk senders and are subject to stricter filtering standards than individual sender accounts.
Trusted Partners for Email Deliverability and List Management
If you would like professional guidance or additional tools to improve your email deliverability and list health, the following trusted partners offer relevant services:
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Email deliverability specialist training, consulting, and software
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List cleaning services
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Form security and list protection
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