Undelivered Mail Returned to Sender

Community Forum
1

Sent out a number emails today as Bcc using my murena.io mail account. Most of them 80% came back as undeliverable.
Message was This is the mail system at host mail2.ecloud.global.

I’m sorry to have to inform you that your message could not
be delivered to one or more recipients. It’s attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

               The mail system

<xxxxxx @hotmail.com>: host
hotmail-com.olc.protection.outlook.com[52.101.42.5] 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=11BB522C1C9A2F70]
[CO1PEPF000042A7.namprd03.prod.outlook.com 2025-06-12T17:37:30.263Z
08DDA9160F90429A] (in reply to MAIL FROM command)

Regain your privacy! Adopt /e/OS the deGoogled mobile OS and online servicesphone

2

I think the keywords here are S3150 + hotmail. This is the result of that forum search Search results for 'S3150 + hotmail order:latest' - /e/OS community.

perhaps Sending from murena.io email to an outlook account - #5 by tcecyk informs.

1 Like
3

Now that I have contacted my Internet service provider. If posting on this forum is contacting my Internet service provider. What do I do?? I have people relying on emails to scheduled meetings.

4

Same problem on my end:

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=11BB54439585F531]
[SA2PEPF000015CB.namprd03.prod.outlook.com 2025-06-13T08:12:25.664Z
08DDAA21CAF41384]

5

It looks like an ongoing issue with Murena. I wanted to leave my old email provider and move to a paid subscription for syncing etc. at Murena. If I can not send emails; none of it is bulk, unless a Bcc of 21 names is today considered bulk mail; when I will have to look for a more reliable provider.