==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.9
- Deployed with iRedMail Easy or the downloadable installer? installer
- Linux/BSD distribution name and version: Ubuntu 16.04
- 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.

====

We are getting this kind of artifact in the mail log where there is only a tld in the message id.  happens rarely but some  mails are being rejected as a result.

Jan 16 07:42:50 mail postfix/cleanup[19711]: A8----------: message-id=<0265--------------------70$@com>

Any idea what's causing this?  Would upgrading postfix to the latest stable version fix this possibly? We're using 3.1.0