On-Prem Exchange Emails Blocked/Delayed by Microsoft365 Domains

%3CLINGO-SUB%20id%3D%22lingo-sub-2050452%22%20slang%3D%22en-US%22%3EOn-Prem%20Exchange%20Emails%20Blocked%2FDelayed%20by%20Microsoft365%20Domains%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2050452%22%20slang%3D%22en-US%22%3E%3CP%3EI%20am%20hoping%20that%20someone%20can%20help%20me%20send%20emails%20from%20an%20On-Prem%20Exchange%202016%20Server%20to%20Microsoft%20365%20Tenants.%20Let%20me%20explain.%3CBR%20%2F%3E%3CBR%20%2F%3E%3C%2FP%3E%3CP%3EAngelbeat%20runs%20Virtual%20Seminars%20for%20Microsoft.%20More%20info%20at%20%3CA%20href%3D%22http%3A%2F%2Fwww.angelbeat.com%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%22%3Ewww.angelbeat.com%3C%2FA%3E.%20I%20setup%20angelbeatseminars.com%20to%20send%20out%20newsletters%20to%20our%20300%2C000%20database%20of%20optin%20email%20addresses%2C%20using%20a%20Dell%20Server%20running%20Exchange%202016.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EWe%20are%20having%20significant%20problems%20sending%20emails%20from%20angelbeatseminars.com%20to%20Microsoft365%20domains%3B%20all%20the%20emails%20get%20delayed%2Fblocked.%20I%20have%20setup%20angelbeatseminars.com%20with%20spf%2C%20dkim%2C%20reverse%20DNS%20lookup%2C%20etc.%20but%20still%20it%20is%20not%20working.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3ECan%20someone%20help%3F%3F%3F%20PLEASE.%20Email%20me%20at%20%3CA%20href%3D%22mailto%3Argerber%40angelbeat.com%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%22%3Ergerber%40angelbeat.com%3C%2FA%3E.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2050452%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3EExchange%20Online%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EExchange%20Server%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EOffice%20365%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2088511%22%20slang%3D%22en-US%22%3ERe%3A%20On-Prem%20Exchange%20Emails%20Blocked%2FDelayed%20by%20Microsoft365%20Domains%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2088511%22%20slang%3D%22en-US%22%3ECheck%20the%20header%20information%20of%20one%20of%20the%20delayed%20email%20and%20put%20the%20complete%20header%20in%20mxtoolbox%20analyze%20header.%3CBR%20%2F%3E%3CA%20href%3D%22https%3A%2F%2Fmxtoolbox.com%2FEmailHeaders.aspx%22%20target%3D%22_blank%22%20rel%3D%22nofollow%20noopener%20noreferrer%22%3Ehttps%3A%2F%2Fmxtoolbox.com%2FEmailHeaders.aspx%3C%2FA%3E%3CBR%20%2F%3ESee%20the%20hops%20and%20you%20should%20get%20some%20answers%20where%20the%20delay%20is%20happening.%3C%2FLINGO-BODY%3E
Occasional Contributor

I am hoping that someone can help me send emails from an On-Prem Exchange 2016 Server to Microsoft 365 Tenants. Let me explain.

Angelbeat runs Virtual Seminars for Microsoft. More info at www.angelbeat.com. I setup angelbeatseminars.com to send out newsletters to our 300,000 database of optin email addresses, using a Dell Server running Exchange 2016.

 

We are having significant problems sending emails from angelbeatseminars.com to Microsoft365 domains; all the emails get delayed/blocked. I have setup angelbeatseminars.com with spf, dkim, reverse DNS lookup, etc. but still it is not working.

 

Can someone help??? PLEASE. Email me at rgerber@angelbeat.com.

 

1 Reply
Check the header information of one of the delayed email and put the complete header in mxtoolbox analyze header.
https://mxtoolbox.com/EmailHeaders.aspx
See the hops and you should get some answers where the delay is happening.