I have this in my main.cf file: relay_domains = example.com
virtual_mailbox_domains=$virtual_mailbox_maps hash:/etc/postfix/vmaildomains virtual_mailbox_maps = ldap:ldapvirtualmap virtual_mailbox_base = /var/vmail/ virtual_transport = maildrop And this is the content of /etc/postfix/vmaildomains: # more /etc/postfix/vmaildomains example.com required Is it necessary to have this domain in relay_domains or does this work without it being there?