We have to run a regular postfix with special setup as mysql virtual_alias_map but the /opt/zimbra/postfix/master.cnf is overwritten at start time.
How to set the smtpd line in master.cnf to:
127.0.0.1:26 inet n - n - - smtpd
smtp inet n - n - - smtpd
We use Debian 4.0 and Zimbra 5.0.18_GA_3011_DEBIAN4.0
Thanks in advance for your help.