The problem I am experiencing is that when a mail being send to Hotmail I get "Mail delivery failed". It doesn't matter what Hotmail email address I am sending to, the result remains the same. Sending to Gmail or official e-mail addresses form no issues. I discovered this problem when my girlfriend received a booking through the contact form. Upon she wanted to reply via "squirrelmail" it failed. I tested this out on my other website hosted on my same VPS server and also there I was able to replicate the same problem. I checked if my server has been blacklisted, however my server is clean. Return-Path: <> Delivered-To: info@*****.com Received: from vps1.******.com by vps1.*****.com (Dovecot) with LMTP id Gj4MCQj8pVdwXgAAO/oQ6Q for <info@******.com>; Sat, 06 Aug 2016 17:02:32 +0200 Return-path: <> Received: from mail by vps1.******.com with local (Exim 4.87) id 1bW37Q-0003rq-2y for info@******.com; Sat, 06 Aug 2016 17:02:32 +0200 X-Failed-Recipients: ****@hotmail.com Auto-Submitted: auto-replied From: Mail Delivery System <Mailer-Daemon@vps1.******.com> To: info@******.com Content-Type: multipart/report; report-type=delivery-status; boundary=1470495752-eximdsn-1376884720 MIME-Version: 1.0 Subject: Mail delivery failed: returning message to sender Message-Id: <E1bW37Q-0003rq-2y@vps1.*****.com> Date: Sat, 06 Aug 2016 17:02:32 +0200 Code (markup): I am stuck, I hope someone has the golden solution. Thanks in advance.
Additional information. It's about the error code "550 SC-001" Based on the code 550 SC-001, its Mail rejected by Outlook.com for policy reasons. Reasons for rejection may be related to content with spam-like characteristics or IP/domain reputation. If you are not an email/network admin please contact your Email/Internet Service Provider for help. But my server is in good standing??
Do you have things like SPF and DKIM enabled for your sending domains ? If your IP has a poor sending reputation Microsoft has a nasty habit of blocking emails from those so you might have to try and improve or look for a 3rd party to send emails from like sendgrid (can be intergrated into most servers with exim)