This post is used to fix missing mail log files in iRedMail. if it doesn't work for you, please post a new topic in General Technical Support forum.
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Abstract

iRedMail-0.6.0 doesn't include two mail log files (/var/log/mail.info, /var/log/mail.err) in logrotate config file (/etc/logrotate.d/maillog), it may eat up too much disk space if we didn't rotate it.

Affected versions

All iRedMail versions, but only occurs on Debian/Ubuntu.

Steps to fix it

* Add missing log files in logrotate config file: /etc/logrotate.d/maillog

# ---- OLD SETTING ----
/var/log/mail.log {

# ---- NEW SETTING ----
/var/log/mail.log /var/log/mail.info /var/log/mail.err {

Credits

Thanks to BigMichi1 for his report.