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We are running a mailing list by OpenEMM for our customers. However, email addresses in the are not delivered.

It seems to us does not accept any email from our domain.

How can this be fixed?

p.s. SPF record is already set up for our domain.

Typical maillog entries:

Sep  9 00:06:02 MAILER sendmail[982]: 0000DB00000001922: to=<>, delay=00:03:11, xdelay=00:00:09, mailer=esmtp, pri=0, [], dsn=5.0.0, stat=Service unavailable
Sep  9 00:14:51 MAILER sendmail[1067]: 0000DB00000001B8A: to=<>, delay=00:12:00, xdelay=00:00:04, mailer=esmtp, pri=0, [], dsn=5.0.0, stat=Service unavailable
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migrated from Sep 9 '13 at 10:06

This question came from our site for pro webmasters.

marked as duplicate by MadHatter, Ward, Dave M, Falcon Momot, Jenny D Sep 10 '13 at 7:31

This question was marked as an exact duplicate of an existing question.

Why don't you ask them that? – Tom O'Connor Sep 9 '13 at 10:39 is bigger than Yahoo and Google in China. Any experience of sending email to them is appreciated. – ohho Dec 5 '13 at 9:59

The log entries you posted indicate the most generic possible failure, 5.0.0 Service unavailable. This says absolutely nothing about why the message was rejected. It could be because the mail server isn't functioning correctly, or because it just doesn't want to talk to you, or any number of reasons. The only real way to find out what's going on is to contact the postmaster at the remote domain.

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