Hello,
Since a couple of weeks I can’t send emails from my murena.io email to outlook accounts as I get a message: “parts of your email domain are on our block list.”
Pls help. This is a very urgent issue to me.
Thx
Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online services
A forum Search 
reveals Murena IP blocked by Microsoft
and Oulook.com pbms?
and Hotmail mails not accepted by e.email
and Microsoft announces new email requirements for bulk senders - Red Sift Blog
and this link https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/strengthening-email-ecosystem-outlook’s-new-requirements-for-high‐volume-senders/4399730 contains an update of 29 April 2025
An indicator of May 5th 2025 “barriers” immediately above would be
The rejected messages will be designated as
“550; 5.7.515 Access denied, sending domain [SendingDomain] does not meet the required authentication level.”
I know. But new is: it worked for some days but now fails again
Still failing on Hotmail
sm@hotmail.com>: host
hotmail-com.olc.protection.outlook.com[52.101.9.27] said: 550 5.7.1
Unfortunately, messages from [135.181.6.248] weren’t sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150). You can also refer your provider to
Troubleshooting. [Name=Protocol
Filter Agent][AGT=PFA][MxId=11BB3FC9E661B5CC]
[BL02EPF0002992A.namprd02.prod.outlook.com 2025-06-06T11:53:02.189Z
08DD9FE4F9656B4B] (in reply to MAIL FROM command)
S3150 is the keyword you’d find many threads for in the forum. The gitlab issue for this is at
if the contact is friends&family, there is a workaround noted in the issue
I have the same problem. Very annoying.
Too may problems with e.email service.
First, some months ago, unable to send end receive mails during several weeks, and now that.
I will switch to something else as soon as possible.
It is happening again.
I’d tend to “again” instead of “still” - but I can’t reproduce on e.email → outlook. At least not the S3150 error from earlier. What’s the bounce that you get?
I can send from murena.io and e.email to outlook without a bounce, though the same mail body+subject that lands e.email directly in the inbox lands mail from murena.io in Junk.
Mind S3150 is not a full block but means mail is being throttled, likely due to a receiving spike from murena. If it’s sustained and you have a paid murena account, I’d contact helpdesk.
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