How to setup the Mail System

One common problem people have is an incorrectly setup mail system.  Here is a list of rules that must be followed:

1) hostname must not match any domain that is being used on the system.  Example, if you have a domain called domain.com and you want to recieve mail on user@domain.com, you must *not* set your hostname to domain.com.  We recommend using server.domain.com instead.  You must make sure that you add the A record for server.domain.com so that it resolves.

2) The hostname must be in the /etc/virtual/domains file.

3) The hostname must *not* be in the /etc/virtual/domainowners file.

4) The hostname must resolve.  If not, add the required A records to the dns zone such that it does.

5) The directory /etc/virtual/hostname must exist.. (eg: /etc/virtual/server.domain.com).  It must not contain any files.

6) Any domains that you want to use for email (eg: domain.com) must be in both the /etc/virtual/domains file and the /etc/virtual/domainowners file.   The directory /etc/virtual/domain.com must exist and the files /etc/virtual/domain.com/passwd and /etc/virtual/domain.com/aliases exist.

7) File permissions for virtual pop inboxes should be (not applicable with Dovecot/Maildir):

/var/spool/virtual/domain.com   770 username:mail
/var/spool/virtual/domain.com/*   660 username:mail