#Email Deliverability

Your email spam score is a number assigned by spam filters — primarily SpamAssassin — that determines inbox vs. junk folder placement. Below 5 is safe; above 10 means blocked. This guide covers how spam scores are calculated, how to check yours free, and 10 concrete fixes: SPF/DKIM setup, list cleaning, content fixes, and blacklist removal.

Email deliverability determines whether your emails land in the inbox or spam. In 2026, the average deliverability rate is 85% — meaning 1 in 6 emails is never seen. This guide covers authentication, sender reputation, list hygiene, and tools to diagnose and fix every common deliverability problem.