mail.protection.outlook.com is blocking many emails

  • Thread starter Thread starter MiniatureBeast
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MiniatureBeast

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Hello Microsoft Community,

I'm developing an app that requires users to validate their email address in order to create an account. Unfortunately, a large portion of emails sent to accounts using Office 365 never reaches the intended recipient. I see that the emails are screened by some sort of "email protection" as my logs indicate that the messages are received by mail.protection.outlook.com (I'm using Mailgun). I can see that the messages are accepted and delivered, but I am certain that roughly half of the recipients never receive the email. Something else I have observed is that it seems if a second email is sent to them then it goes through.


I read that I can use the "delist" tool in order to remove my email address from a spam blacklist (https://sender.office.com) but upon submitting my

address and IP address to the form provided, I never receive the email that the tool tells me is coming, so that's been a dead-end for me.



Any help would really be appreciated!

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