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Invalid Addresses; Caused by: 501 5.1.6 Recipient addresses in single label domains not accepted

Question asked by DarrellFlenniken9941 on Jun 10, 2016
Latest reply on Jun 10, 2016 by DarrellFlenniken9941

I am getting  this error  intermittently when sending mail.

 

Using smtp.office365.com

Email send-to addressees are static and have not changed in 6 weeks.

The integration has been running for 6 weeks without this error occurring then it started to occur intermittently a week ago

 

Anyone else see this?  Any Ideas?

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