==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 1.6.5
- Deployed with iRedMail Easy or the downloadable installer? download
- Linux/BSD distribution name and version: Rocky 8.8
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): Mysql
- Web server (Apache or Nginx): nginx
- Manage mail accounts with iRedAdmin-Pro? non-Pro
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

rar virus attachment seems not to be tested by amavisd.
is any customization needed?

in ubuntu distribution, there is a libclamunrar for this and unrar-free/unrar is installed and required by packages.sh.

but it is not required in RHEL related distribution in packages.sh.

Thanks.