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Question : dsn=5.0.0, stat=Service unavailable
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I have a mailing list at lists.mydomain.com and wanted to subscribe to it with an email of anything@mydomain.com but the confirmation message didn't reach me. I checked the log files of lists.mydomain.com server and can see
Jan 1 02:10:20 server sendmail[4248]: k0s41sbbp04546: to=, delay=00:00:00, xdelay=00:00:00,mailer=esmtp, pri=229720, relay=control.mynet.net. [63.175.195.228], dsn=5.0.0, stat=Service unavailable
where ;; ANSWER SECTION: mydomain.com. 1165 IN MX 10 control.mynet.net.
I can subscribe using other emails so I guessed the problem is only with emails @mydomain.com and I checked and found that those emails @mydomain.com works. I was confused where the problem lies!
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Answer : dsn=5.0.0, stat=Service unavailable
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1) Could you publish email "bounce" message you have received? [ It usually contains more hints ]
2) You can send a test message to anything@mydomain.com with SMTP session tracking
As root (sendmail-8.12+) execute: ( echo subject: test; echo ) | sendmail -v -oi anything@mydomain.com
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