Forum Discussion
Email address blocked from sending messages
We are a small charity with only about 250 members. It is most annoying that at some arbitrary point, after we have circulated a message to all members, that the sending email address gets blocked from sending further messages to external email addresses.
Investigation shows that the sending address has been deemed as sending spam even though the messages are legitimate. I then have to manually remove the block. Is there a way to prevent this happening?
I need to find a solution to this as I have now implemented Office365 for a second charity and I do not want them to suffer from the same issue.
The research I have done only yields a fix to tell a remote address that the email is not spam. My problem is that O365 has deemed the address as a spammer and will not allow email be delivered to external addresses.
Any help would be appreciated.
2 Replies
We have had this happen a few times for legitimate emails and had to open a support case with Microsoft. They will likely need one of the messages that caused the issue to review headers, but are able to do something on their side to help prevent this from happening. The easiest way I've found to grab the original message with all of the details they need is to update your Outbound Spam policy in the Exchange Admin Center to send notification when senders are blocked. You will get a copy of the message that was blocked as potential outbound spam along with the alert.
If you have senders that are already blocked, you can unblock them using the remove-blockedsenderaddress cmdlet. If you have multiple that you'd like to remove in one go, you can use the info in my blog post: https://itspartlycloudy.com/2018/03/09/removing-multiple-blocked-senders-from-eop/.
@ Jeremy Miller
Thanks for your input. However that requires an email address to be blocked.
This has not yet happened on the O365 tenant of the second charity that I do O365 support for.
I need to prevent this happening as blocked emails could have a negative impact on an intended recipients wellbeing!
In the case of the first charity, we have been operating O365 for nearly 3 years without problem. Now we have had 3 accounts blocked in the past few months.
All I want is some way of preventing legitimate users being arbitrarily blocked from sending emails to external addresses.
