Email issues to a specific email provider (bellsouth.net) failing with "stat=Data format error"
Solution 1:
Suggested debug procedure for deliveries to example.net :
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Use mailertable entry below to select dsmtp mailer for deliveries to
example.net:examle.net dsmtp:%0
It will put message to example.net in queue without delivery attempt
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As root push queened messages for
example.netin verbose mode (with smtp session transcript). Execute the command below in terminal:sendmail -v -qRexample.net