Mail delivery failed: returning message to sender

[jofese]

Hi, good morning, I have a problem with sending mail:
Install vestacp on my vps, I made the basic settings, and everything works fine, I can receive emails, as well as send mails to gmail, the problem is when I try to send an email to hotmail, outloook answers this message:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
host mx4.hotmail.com [207.46.8.199]
SMTP error from remote mail server after MAIL FROM:<[email protected]> SIZE=1933:
550 SC-001 (BAY004-MC6F16) Unfortunately, messages from 123.123.123.123 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.
Reporting-MTA: dns; panel.mydomain.com

Action: failed
Final-Recipient: rfc822;[email protected]
Status: 5.0.0
Remote-MTA: dns; mx4.hotmail.com
Diagnostic-Code: smtp; 550 SC-001 (BAY004-MC6F16) Unfortunately, messages from 123.123.123.123 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.
Asunto Correo de prueba
De user name lastname
Destinatario any user
Fecha Hoy 17:12
Return-path: <[email protected]>
Received: from admin by panel.mydomain.com with local (Exim 4.86_2)
(envelope-from <[email protected]>)
id 1cvWgR-0007N8-1t
for [email protected]; Tue, 04 Apr 2017 22:12:15 +0000
To: any user <[email protected]>
Subject: prueba
X-PHP-Originating-Script: 0:rcube.php
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII;
format=flowed
Content-Transfer-Encoding: 7bit
Date: Tue, 04 Apr 2017 17:12:15 -0500
From: user name lastname < [email protected]>
Organization: My Corporate
Return-Receipt-To: user name lastname <[email protected]>
Disposition-Notification-To: user name lastname
<[email protected]>
Message-ID: <[email protected]>
X-Sender: [email protected]
User-Agent: Roundcube Webmail/1.2-beta

correo de prueba

--
Atte.

User name lastname

Analyze my domain at mxtoolbox.com to find flaws and see if I'm blacklisted, but everything is okay apparently.
I thank you in advance for your support. regards

[LouisUK]

MS are quite strict on their guidelines when sending to hotmail/outlook. If you're sure you have the correct DNS records such as SPF etc, then I would try contacting them to see if they have blocked your IP. My VPS IP was blacklisted from whomever had it previously for spamming and I filled out a contact form and they could see I am legit and allowed access. Try this link: https://support.microsoft.com/en-us/get ... =edfsmsbl3

[jofese]

MS are quite strict on their guidelines when sending to hotmail/outlook. If you're sure you have the correct DNS records such as SPF etc, then I would try contacting them to see if they have blocked your IP. My VPS IP was blacklisted from whomever had it previously for spamming and I filled out a contact form and they could see I am legit and allowed access. Try this link: https://support.microsoft.com/en-us/get ... =edfsmsbl3

Thanks I will try to communicate with them, any answer I communicate them by the forum.
Thank you so much