This post is used to fix bug in iRedMail. if it doesn't work for you, please post a new topic in iRedMail General Technical Support forum.
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Abstract:
- There will be a file permission error if you enable below crontab job (it's disabled by default) of vmail user:

#1   5   *   *   *   find /var/virusmails -ctime +30 | xargs rm -rf {}

We'd like to thank jbou for his report.

Affected versions:

- iRedMail-0.5.1
- iRedMail-0.5.0
- iRedOS-0.5.0

Steps to fix it:

• Add same cron job of amavis user.

# ---- Run below command in terminal ----
# sudo crontab -e -u amavis

# ---- RHEL/CentOS ----
1   5   *   *   *   find /var/virusmails -ctime +30 | xargs rm -rf {}

# ---- Debian/Ubuntu ----
1   5   *   *   *   find /var/lib/amavis/virusmails -ctime +30 | xargs rm -rf {}

If you don't want to enable it, just prepend '#' in this line to comment it.

• Comment out or delete this cron job of vmail user.

# ---- Run below command in terminal ----
# sudo crontab -e -u vmail