Delivering emails to Outlook / Hotmail - Error (550 SC-001)

posted by SwiftCloudHosting in DNS and Emails
1893

If you happen to face an error while trying to deliver emails from your domain (@domain.com) to Outlook / Hotmail servers and you keep getting a bounce back error message like the following one :

550 SC-001 (BAY004-MC1F45) Unfortunately, messages from (x.x.x.x) weren't sent.
Please contact your Internet service provider since part of their network is on our block list.

It means a few things are going wrong with your sending domain.

Here are a few steps to solve this issue :

1.  You want to assure you have your SPF records set-up. If you do not have these, please read our other article on how to set-up SPF records.

2. Microsoft mainly blocks any email that does not have their Reverse DNS set-up properly. It is not only a recommended step for email sending, but mainly a more than needed DNS record  to have set-up. Follow our article on setting up your reverse DNS.

3. If you are still getting a denial after Step 1 and 2, you will be required to contact Microsoft to unblock your IP address.  Unblocking your IP with Microsoft.

Note : Your server IP can be found within your VPS control panel.

SwiftCloudHosting Recommandation

1. Test your emails ! Use an awesome 3rd party tool to test and see how well your emails scores on spam. Check out Mail-Tester web application. It's easy to use and accurate. 

2. Register with Microsoft Smart Data Network to better understand and improve your reputation with Microsoft email filtering.

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