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What happens if you try telnetting into your mail server from your local computer?
try something like this:
telnet mail.yourserver.com 25
when it responds, type "ehlo mail.yourserver.com" (hit enter)
then paste the output here. (type quit to end the telnet session)
A typical session should look like this:
telnet mail.whatever.com 25
Trying xx.xx.xx.xx...
Connected to mail.whatever.com.
Escape character is '^]'.
220 mail.whatever.com ESMTP Postfix
ehlo mail.whatever.com
250-mail.whatever.com
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH LOGIN CRAM-MD5 PLAIN DIGEST-MD5
250-AUTH=LOGIN CRAM-MD5 PLAIN DIGEST-MD5
250 8BITMIME
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