Email to SMS is being blocked


We are receiving the following blocked message:


This is the mail system at host

I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can delete your own text from the attached returned message.

The mail system

<**********>: host[] said: 550 permanent

    failure for one or more recipients (********** (in

    reply to end of DATA command)


Please advise how to proceed.

3 replies

Userlevel 3
Badge +6

Call Tmobile and ask about Whitelisting. However, if you send SMS ads that are repeatedly blocked by many Tmobile customers, you may continue to have a great deal of trouble with the Tmobile software that blocks robo/spam SMS.


@sweetpeach it is impossible to get thru to a Tech.  I have called the last couple of days and I hang up after 30 minutes waiting.  Is there a link I can chat with someone?

Userlevel 3
Badge +6

Try Tmobile T-Force on Facebook or Twitter. :wink: