Forum Discussion
421 4.2.0 sender rejected AUP#SNDR
I manage a few mail servers for my employer. We noticed that we are being blocked by T-Mobile (relay=tmo-east.mx.a.cloudfilter.net). We send a lot of messages to our customers' SMS gateway addresses ...
And Cloudfilter runs via Amazon web services, which, if you sign up and read their stuff about email filtering, it has a mechanism for creating a "verified identity" for an email address. It's a long shot, but I started trying to do that, but it made me think that maybe if I send from my email that is on my sprint account… maybe it would magically work? I don't know. I'm grasping at straws.
