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Sendmail has these errors--Domain of sender address <> does not exist

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Operating Systems Linux Sendmail has these errors--Domain of sender address <> does not exist
# 1  
Old 07-05-2012
Sendmail has these errors--Domain of sender address <> does not exist

Does anyone has a clue of what is going on here? It was working few days ago. /etc/hosts looks ok, sendmail does restart without any errors, telnet is successful. I will be happy to send you guys any output required.

Diagnostic-Code: SMTP; 553 #5.1.8 Domain of sender address <> does not exist

Domain of sender address <> does not exist

[root@tiger mail]# /usr/lib/sendmail -Am -v </dev/null Connecting to via relay...
>>> EHLO
250-SIZE 20971520
220 Go ahead with TLS
>>> EHLO
250 SIZE 20971520
>>> MAIL From:<>
553 #5.1.8 Domain of sender address <> does not exist
/root/dead.letter... Saved message in /root/dead.letter
Closing connection to
>>> QUIT

Last edited by methyl; 07-05-2012 at 04:42 PM.. Reason: please use code tags
# 2  
Old 07-05-2012
Not quite sure what you are trying to do here, but lets assume that this is an Internet-facing server, not a sandbox.
If you are the owner of the domain (unlikely?) you appear to have not registered and and you are therefore failing a reverse DNS lookup.
Eventally the Internet Police will block your IP.

Good luck.

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