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You could try putting "mail.aaa.com" ahead of "localhost.localdomain", but I doubt that will change anything.
Also, maybe you can try omitting "mail.aaa.com" from the localhost line in /etc/hosts altogether.
Normally 127.0.0.1 is localhost (or localhost.localdomain), nothing else.
Receiving mail from a mail server uses POP3 or IMAP protocol most likely.
Sending mail out is done via SMTP. As SMTP uses a different port as the other protocols,
the first suspect would be that the SMTP port (number 25) is blocked.
So, check the firewall on your host and on the mail server and see if they
allow access to port 25 on the server.
You can also verify that access is allowed/blocked by executing:
Code:
telnet your_mail_server 25
If that connects, then there is no firewall blocking port 25. If it doesn't, check the firewall configs and other security measures involved.
the main thing you should watch out for is the masquerade_domains line - it's what prevents the "mail" part on "mail.aaa.com" from showing up after the @ everytime you send mail.
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