Managing spam issues and improving deliverability after mailbox warming

Last updated: March 2, 2026

If your email sequences are being marked as spam by recipients after the mailbox warming process, this typically indicates deliverability issues with your actual campaigns rather than problems with the warming emails themselves. Here's how to diagnose and resolve these issues.

Diagnosing the problem

First, check the performance metrics of your email sequences to determine the scope of the issue:

  • Review your open rates and reply rates

  • Compare current metrics to previous performance

  • Determine if this is an isolated case or part of declining engagement across campaigns

Solutions to improve deliverability

If you're experiencing deliverability issues, try implementing these solutions:

Turn off open tracking

Disable open tracking in your sequences, as tracking pixels can sometimes trigger spam filters.

Reduce links in email content

Remove excess links from your emails. Too many links can cause your emails to be flagged as spam by email providers.

Increase email variability

Add more variability to your email copy by using snippets or variables. This helps avoid pattern recognition by spam filters and makes your emails appear more personalized and legitimate.

When to seek additional help

If you've implemented the above solutions and are still experiencing deliverability issues, contact the deliverability team for additional support. They can provide more advanced troubleshooting and recommendations specific to your account.

These steps will help improve your sender reputation, enhance email deliverability, and reduce the likelihood of your emails being marked as spam by recipients.