Issue I cant send email to hotmail

[bashaclick]

Server operating system version

Ubuntu 22.04

Plesk version and microupdate number

18.0.74

Hello ,
I have an issue. I can't send any email to hotmail or outlook but yahoo or gmail I can recived without any issue. I checked with hotmail and my ip not in black list.

Message -->

This is the mail system at host XX.XXX.XXX.

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

<@hotmail.com>: host
hotmail-com.olc.protection.outlook.com[52.101.41.29] said: 550 5.7.1
Unfortunately, messages from [xx.xx.xx.xx] 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
http://mail.live.com/mail/troubleshooting.aspx#errors. [Name=Protocol
Filter Agent][AGT=PFA][MxId=11BC8B6894A64713]
[SJ1PEPF00002322.namprd03.prod.outlook.com 2025-12-30T22:14:03.354Z
08DE45B44C981317] (in reply to MAIL FROM command)

 

[Bitpalast]

... I checked with hotmail and my ip not in black list. ..

Yes it is.

Unfortunately, messages from [xx.xx.xx.xx] weren't sent. Please contact
your Internet service provider since part of their network is on our block
list (S3150).

If you have tried the delisting service Sign in to your account
be aware, that the first email you get from them always states, that there is no error non MS side. However, you need to respond to that email and bring your case forward again, e.g. send them their return mail, then a real human will take care of it and create an exception for your single server IP from their subnet ban.