Is anyone able to contact GTT?

Tue Dec 10 05:41:04 UTC 2019

I sent an email to noc at gtt.net from 2 different emails and both got a
reply saying:

5.1.0 - Unknown address error 550-'5.4.1 Recipient address rejected: Access
denied [HE1EUR01FT058.eop-EUR01.prod.protection.outlook.com]'

Not sure if this means if they are blocking my email or if their email is
broken.
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