Question Mail messages problem

[Francisco]

I had a vpserver in server4you.com, and i use the last version plesk panel. My problem is:

When i try to send mail messages to specific domain (Hotmail.com), this error message appears:

This is the mail system at host usve250404.serverprofi24.com.

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

<garcia.algeba@hotmail.com>: host mx4.hotmail.com[207.46.8.199] said: 550
SC-001 (BAY004-MC6F6) Unfortunately, messages from 207.38.82.202 weren't
sent. Please contact your Internet service provider since part of their
network is on our block list. You can also refer your provider to
http://mail.live.com/mail/troubleshooting.aspx#errors. (in reply to MAIL
FROM command)


I asked to support, and them answer me this:

he message is poorly worded. Please ensure that the following items are set:
1. The SMTP banner/helo is set to a non-generic hostname
2. The reverse DNS is set and matches the SMTP banner/HELO
3. SPF and DKIM records are set.

Your email should then reach MSN/gmail destinations.

But I am a beginner in plesk panel.

Somebody can help me?

Thanks.

 

[Bitpalast]

It does not matter what your configuration is. Your server or an IP range that your server is in was blacklisted by Microsoft. This happens rather frequently, and it sure happens when your server is sending spam. When you are sure that your server is not sending spam, you can request a delisting of your server's IP:
https://support.microsoft.com/en-us...productkey=edfsmsbl3&ccsid=635648144919316674

Here you can check whether your server is on other blacklists: http://multirbl.valli.org/lookup/