As your product scales, user engagement depends heavily on reliable email delivery. If your transactional or marketing emails are triggering spam blocks, your domain capacity is compromised.

Resolving this isn’t just about tweaking your DNS records. It requires treating your domain infrastructure like a core production system. You need to implement a complete 14-day outbound cooldown, followed by isolated, reply-driven warmups capped at 80 messages per day to rebuild reputation scores with major postmasters.

Before writing any custom scripts or shifting providers, run a diagnostic using an external domain blacklist checker to confirm where your IPs are flagged.

We have documented the entire technical recovery cycle and authentication setup on our blog:

https://www.exactverify.com/blog/blacklisted-email-domain-recovery