==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.7.4
- Deployed with iRedMail Easy or the downloadable installer? Yes
- Linux/BSD distribution name and version: Ubuntu 22.04 LTS
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): (Backend: mariadb)
- Web server (Apache or Nginx):NginX
- Manage mail accounts with iRedAdmin-Pro? Yes
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====
Hi all,

I’m running into a really frustrating issue and I hope someone here can give me some advice.

Whenever I send emails from my iRedMail server to big providers like Gmail or Outlook/Hotmail, the messages often either:

Get rejected with errors like 550 5.7.1 – Message not accepted due to spam/DMARC policies, or

End up in the Spam/Junk folder, even though I’ve already set up SPF, DKIM, and DMARC correctly.

Microsoft seems to be especially strict — even with a fresh server and clean IP, I still get delivery problems.

Is there anything extra I should configure in DNS (aside from SPF/DKIM/DMARC and rDNS)?

I’ve spent a lot of time tweaking configs, but the results are still inconsistent. Any practical tips or personal experiences would be really appreciated.

Thanks in advance!