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Certain domains unable to deliver mail to recipient - Delayed, then failing
Problem reported by David Short - 4/27/2018 at 8:30 AM
Submitted
After enabling TLS and SSL, certain external domains get bounce notifications "Delivery is delayed to these recipients or groups:"  The email addresses are valid and hosted on the system.
 
Diagnostic information in the header says Remote Server returned '554 5.4.' answercentrela . com #4.0.0
 

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David Short Replied
4/27/2018 at 9:09 AM
This seems to occur with only one domain right now, appriver.com, a mail hosting service
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Ryan Wittenauer Replied
4/27/2018 at 10:46 AM
David, same issues we are having and are discussing here: https://portal.smartertools.com/community/a90599/smtp-tls-connections-failing.aspx
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David Short Replied
4/27/2018 at 11:30 AM
Thanks Ryan!
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