When the recipient domain matches mydestination (or any IP address literal that matches inet_interfaces or proxy_interfaces).
1) local(8) will accept the recipient ONLY if the username is
found. It does not look for usern...@domain.
2) However, smtpd(8) will accept the recipient if either the
usern...@domain or the username are found.
So, be sure that you don't have u...@domain forms in $alias_maps.
Wietse
