==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.0
- Deployed with iRedMail Easy or the downloadable installer? downloadable installer
- Linux/BSD distribution name and version: debian 11
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- 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.
====
Hello,
I would like to ask about fail2ban filters.
Why does emails sent from our server MAILER-DAEMON@myexample.com are viewed in the logs as from=<> ?
Our email system logs it as
"Recipient address rejected: Policy rejection due to null sender; from=<> "
which triggers fail2ban to ban IP addresses after few tries like that.
Thank you.