- Plesk Onyx
- Gmail marks emails as spam. Emails are successfully delivered to other email servers.
- All checks in Gmail marked as "pass"
- Due to misconfiguration, SPF was failed previously.
- Gmail detects message as spam with the note "It's similar to messages that were detected by our spam filters" or "Why is this message in spam? It is similar to messages that were identified as spam in the past.":
Your emails to Gmail accounts are being classified as spam since they do not comply with the Bulk Sender's Guidelines.
Follow Google's official guideline for senders to prevent the issue.
Note: When a sender is valid, he might still have problems delivering mail to Gmail users while the domain reputation is being restored. It can take some time.