HELO mail.external.tld MAIL FROM: user@external.tld RCPT TO: nouser@localhost.localdomain DATA From: Docker Mail Server <dockermailserver@external.tld> To: Existing Local User <user1@localhost.localdomain> Date: Sat, 22 May 2010 07:43:25 -0400 Subject: Test Message non-existing-user.txt This is a test mail. . QUIT