posted on 07:38 AM on Monday 06 July 2015
On the CentOS machines and probably other distros that uses postfix, the mailbox_size_limit
limits the size of the mailboxes. See http://www.postfix.org/postconf.5.html for the configuration details. I set mailbox_size_limit = 0
in /etc/postfix/main.cf
and restart postfix for this to work.