Mail server aliases, loops and confusion

I have a server set up to handle mail. The server name is xserveone.mydomain.com. I have 2 mail aliases set which are mydomain.com and mail.mydomain.com. Since this is a test server my MX records are pointing to another server but mail.domain.com is not among them so I should be able to send mail directly to the test server. When I send mail to me@mail.mydomain.com the message is bounced. The SMTP log contains the following (sanitized for only, hopefully, critical messages); Feb 3 10:15:06 XserveONE postfix/smtpd[7432]: connect from xserveone.mydomain.com[xxx.xxx.xxx.141] Feb 3 10:15:06 XserveONE postfix/smtp[7431]: warning: host xserveone.mydomain.com[xxx.xxx.xxx.141] greeted me with my own hostname mail.mydomain.com Feb 3 10:15:06 XserveONE postfix/smtp[7431]: warning: host xserveone.mydomain.com[130.205.111.141] replied to HELO/EHLO with my own hostname mail.mydomain.com Can someone tell me what I'm doing wrong with my setup? TIA.