I've used tmomail.net for a couple of years. Sometime between Sep 30 and Oct 3 the servers {dal or chi}-tmo-mm3-syniverse.com started rejecting messages from my mail server with the message: 544 rejecting banned content.
I've done some testing:
- What works:
- If I test with a gmail account, the message is delivered to my cell phone.
- My mail server can deliver the same message to <phone>@vtext.com to a friend's phone.
- What generates the same error:
- Prefixing my phone number with a "1".
- Using the T-Mobile phone number of my data device, my son's phone or my daughter's phone.
- Using a simple message with subject "test" and body "test" that has no content worthy of banning.
Would you say that the tmomail.net servers have effectively blocked my email server? Has anyone else had
this issue and had it resolved? Has anyone had their email server whitelisted?
Thanks,
Bill
Best answer by tmo_lauren
I took a look at known issues for this and found:
REFERENCE ID: NA
IMPACT: Customers may be unable to receive messages to messages to their MSISDN@tmomail.net address. To help aid the attack against SPAM, T-Mobile is now blocking traffic where the sending Domain is altered from the true sending address: IE support@customerservice.com, when the domain is actually is support@gmail.com. senders will receive a 550 bounceback error . To correct this issue, Senders will need to revert their sending address to their actual email address. For assistance, direct customers to the sending party, and sending parties to their domain customer support. this service is functioning properly.
ETR: No ETR - The service is functioning normally.
This sounds like what may be impacting you, so you may need to contact the sending domain directly!
-Lauren