Our IP is blocked by Microsoft system. Failier message; 550 SC-001 (SNT004-MC2F11) Unfortunately, messages from 162............ weren't sent.! We need be unblock because we are not spamer!

Sincerely,

Niik.F

• Moved by Jason Johnston [MSFT]Microsoft employee 5 hours 21 minutes ago Not a development questions.

Hi Niik.F,

You can check your IP against blacklists:

http://mxtoolbox.com/blacklists.aspx

you can also check your Sender ID Framework with microsoft on below link

https://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/