Can a clean IP still be filtered?

Yes, a clean IP can absolutely be filtered. IP reputation is only one factor among many that filters evaluate.

Domain reputation may be poor even when IP reputation is clean. If your domain has history of problems, messages may be filtered regardless of the IP.

Content issues can trigger filtering independently. Spam patterns, suspicious links, or poor HTML may cause filtering even from pristine infrastructure.

Authentication failures create problems regardless of IP cleanliness. Missing or misconfigured SPF, DKIM, or DMARC undermines trust.

Engagement problems accumulate independently. If recipients do not want your mail, filters learn this regardless of IP history.

Focusing only on IP reputation misses the bigger picture. All factors must align for reliable inbox placement.

A clean ship still faces inspection of its cargo and crew. IP reputation opens one gate; others remain to pass.