Email address is constantly blocked

%3CLINGO-SUB%20id%3D%22lingo-sub-1057630%22%20slang%3D%22en-US%22%3EEmail%20address%20is%20constantly%20blocked%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1057630%22%20slang%3D%22en-US%22%3E%3CP%3EHi%20all%2C%3C%2FP%3E%3CP%3Elooking%20for%20advice%20regarding%20blocked%20email%20addresses.%3C%2FP%3E%3CP%3EIn%20protection.office.com%2Frestrictedusers%20I%20have%201%20email%20address%20that%20is%20being%20blocked%20every%2048h.%3C%2FP%3E%3CP%3EThe%20issue%20is%2C%20this%20is%20really%20important%20to%20address%20%26amp%3B%20it%20is%20not%20sending%20SPAM%2FPHISH%20of%20any%20kind.%3C%2FP%3E%3CP%3EThe%20address%20is%20being%20used%20to%20send%20a%20lot%20of%20emails%20(to%20users%20in%2015%20different%20countries).%3C%2FP%3E%3CP%3EIt%20sends%20around%201000%20emails%20every%2024-48h%20%26amp%3B%20it%20is%20automatically%20blocked%20by%20Microsoft.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EAny%20idea%20of%20how%20to%20stop%20this%20blocking%3F%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EKind%20regards%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-1057630%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3E2016%3C%2FLINGO-LABEL%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-1057824%22%20slang%3D%22en-US%22%3ERe%3A%20Email%20address%20is%20constantly%20blocked%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1057824%22%20slang%3D%22en-US%22%3E%3CP%3EHello!%26nbsp%3B%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F390770%22%20target%3D%22_blank%22%3E%40DiVojich%3C%2FA%3E%26nbsp%3B%3CBR%20%2F%3E%3CBR%20%2F%3EHow%20is%20the%20mail%20address%20sending%20these%20bulk%20emails%3F%20Is%20it%20over%20port%2025%20(%20Un%20authenticated%20SMTP%20)%26nbsp%3B%3CBR%20%2F%3EOr%20bort%20587%20(%20Secure%20SMTP%20)%26nbsp%3B%3CBR%20%2F%3E%3CBR%20%2F%3EWe%20need%20this%20information%20to%20assist%20further.%26nbsp%3B%3CBR%20%2F%3EBasic%20Anonymous%20mail%20over%20port%2025%20usually%20gets%20blocked%20in%20these%20bulk%20scenarios.%3CBR%20%2F%3E%3CBR%20%2F%3EKind%20Regards%3CBR%20%2F%3EOliwer%20Sj%C3%B6berg%3CBR%20%2F%3E%3CBR%20%2F%3E%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-SUB%20id%3D%22lingo-sub-1062316%22%20slang%3D%22en-US%22%3ERe%3A%20Email%20address%20is%20constantly%20blocked%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-1062316%22%20slang%3D%22en-US%22%3E%3CP%3EHi%2C%20it%20is%20port%20587%3CA%20href%3D%22https%3A%2F%2Ftechcommunity.microsoft.com%2Ft5%2Fuser%2Fviewprofilepage%2Fuser-id%2F345947%22%20target%3D%22_blank%22%3E%40oliwer_sjoberg%3C%2FA%3E%26nbsp%3B%3C%2FP%3E%3C%2FLINGO-BODY%3E
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Contributor

Hi all,

looking for advice regarding blocked email addresses.

In protection.office.com/restrictedusers I have 1 email address that is being blocked every 48h.

The issue is, this is really important to address & it is not sending SPAM/PHISH of any kind.

The address is being used to send a lot of emails (to users in 15 different countries).

It sends around 1000 emails every 24-48h & it is automatically blocked by Microsoft.

 

Any idea of how to stop this blocking?

 

Kind regards

2 Replies
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Hello! @DiVojich 

How is the mail address sending these bulk emails? Is it over port 25 ( Un authenticated SMTP ) 
Or bort 587 ( Secure SMTP ) 

We need this information to assist further. 
Basic Anonymous mail over port 25 usually gets blocked in these bulk scenarios.

Kind Regards
Oliwer Sjöberg

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Hi, it is port 587@oliwer_sjoberg