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Angelbeat_Ron_Gerber's avatar
Angelbeat_Ron_Gerber
Copper Contributor
Jan 11, 2021

On-Prem Exchange Emails Blocked/Delayed by Microsoft365 Domains

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 http://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 mailto:rgerber@angelbeat.com.

 

exchange online
Exchange Server
office 365

1 Reply

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  • saifs1980's avatar
    saifs1980
    Copper Contributor
    Jan 22, 2021
    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.

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