Simple Rules to follow to setup a Mail System
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.
For DirectAdmin
- The hostname must be in the /etc/virtual/domains file.
- The hostname must *not* be in the /etc/virtual/domainowners file.
- The hostname must resolve. If not, add the required A records to the dns zone such that it does.
- The directory /etc/virtual/hostname must exist.. (eg: /etc/virtual/server.domain.com). It must not contain any files
- 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.
- File permissions for virtual pop inboxes should be (not applicable with Dovecot/Maildir):
/var/spool/virtual/domain.com/* 660 username:mail
- Make sure that your main server IP has a reverse lookup on it.
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