D G Teed:
> Aug 30 22:30:20 myself postfix/smtpd: NOQUEUE: reject: RCPT from
> mta03.anisp.ca[22.214.171.124]: 550 5.1.1 <1234567t@...>: Recipient
> address rejected: User unknown in local recipient table
> However, if the email address is of the format of 6 numbers followed by a
> letter, then the message is
> queued and bounced.
As documented, and mentioned frequently here, wild-card canonical
and virtual alias mappings break recipient address validation in the
Postfix SMTP server, resulting in accept-then-bounce behavior.