Forum Discussion

DiVojich's avatar
DiVojich
Brass Contributor
Dec 10, 2019

Email address is constantly blocked

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 importan...
2016
exchange online
Exchange Server
office 365
oliwer_sundgren's avatar
oliwer_sundgren
Steel Contributor
Dec 10, 2019

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