blocking messages




    My home automation system sends me SMS messages using T-Mobile's email to SMS gateway.  I have been using it successfully for a number of months, but recently, my messages have been blocked.  I have included a sample rejection notice below.  Does anyone know precisely why my messages are being blocked all of a sudden and how to get around this?


    Thanks so much for your help.



    Error Icon

    Message blocked

    Your message to has been blocked. See technical details below for more information.

    The response was:

    550 permanent failure for one or more recipients (


    Final-Recipient: rfc822;

    Action: failed

    Status: 5.0.0

    Remote-MTA: dns; (, the

    server for the domain

    Diagnostic-Code: smtp; 550 permanent failure for one or more recipients (

    Last-Attempt-Date: Fri, 01 Sep 2017 19:15:53 -0700 (PDT)


    ---------- Forwarded message ----------

    From: Home Automation System <>

    To: "" <>



    Date: Fri, 01 Sep 2017 20:11:32 -0600

    Subject: <message subject>

    <message body>

      All replies

      • j.a.r.v.i.s

        Re: blocking messages

        Looks like the email was blocked intentionally magenta2540820 - There are a few similar threads - check them out and post back if you don't get anywhere...


        email to sms gateway issues


        email to rejected for banned content

        2 of 2 people found this helpful
          • magenta2540820

            Re: blocking messages

            Thanks for your reply.  I looked through those posts, but couldn't find an answer.  I'm using gmail SMTP to send my email and Gmail seems fine with my authentication/authorization.  When I look at the headers of the email, it passes SPF, DKIM, and the other checks mentioned in those posts.  I'm not sure why my emails are being blocked all of a sudden and what the rules are that I need to follow for them to work successfully with the service.  Thanks again for your help!

            1 of 1 people found this helpful
              • j.a.r.v.i.s

                Re: blocking messages

                From what I read, it appeared that there was some learning/training to identify good/bad inbound messages.  Since it's something on the backend, probably out of scope for a customer facing support portal.  Did you try the enterprise support that was referenced?  Wonder if any of the @tmo_ users can comment...

                • tmo_amanda

                  Re: blocking messages

                  Hey, magenta2540820!


                  I'm not sure why it stopped all of the sudden, but as j.a.r.v.i.s mentioned, you aren't the only one this is happening to. I just chatted with one of our Engineers regarding this and here are a few things he recommended trying:


                  • If you're a DIGITS user, we recommend installing the app on your phone. Messages are successfully being sent and received through the app.
                  • If there's an option for the email to be sent via HTML format, it should force the email to stay as MMSC. I know this option isn't always available especially if it's coming from a larger company such as your home automation system.


                  If neither of these workarounds work, the next step would be to contact Tech Support and file a ticket with them. The more tickets that are filed, the easier it is for our Engineers to determine why this is happening.

                    • magenta2629596

                      Re: blocking messages

                      Having same problem. Started last week.


                      This message was created automatically by mail delivery software.


                      A message that you sent could not be delivered to one or more of its

                      recipients. This is a permanent error. The following address(es) failed:



                          host []

                          SMTP error from remote mail server after end of data:

                          550 permanent failure for one or more recipients (



                      I've had no problems for many years....except when sending a url. I have to remove http.

                        • dtmgallagher

                          Re: blocking messages

                          I am getting the same message as of last week and reported it to Tmobile support but they do not have an answer yet the very same barracuda network device is associated with Tmobile.


                          This is part of what I get back as being blocked.



                          Remote Server returned '< #5.0.0 smtp; 550 permanent failure for one or more recipients (>'

                          Original message headers:

                          Return-Path: <>

                          Received: from (localhost [])

                          by (Postfix) with ESMTP id 3zQDgr04l1z2hsWBB

                          for <>; Mon, 22 Jan 2018 14:43:20 +0000 (UTC)

                          X-USANET-Received: from [] by via mtad (C8.MAIN.4.10L)

                          with ESMTP id 598waVoro4736Me4; Mon, 22 Jan 2018 14:43:14 -0000

                      • magenta7612013

                        Re: blocking messages

                        Hey, is anybody here hearing anything concrete about what these "RATE LIMITS" are for sending to: TMOMAIL.NET ???


                        I'm sure that's the NUMBER ONE (1) REASON why MOST of us are here reading this Thread RIGHT NOW...


                        So MOST ALL of us,


                        1) NEED to get a certain email "unblocked" from our NUMBER@TMOMAIL.NET account

                        and also

                        2) NEED to KNOW what these RATE LIMITS are that got us "BANNED" in the FIRST PLACE.... It's PRETTY HARD to KNOW when they aren't posted up anywhere and it's literally almost TABOO to find any information at all on the Subject... it's really riddiculous: the Internet is supposed to stand for the EXACT OPPOSITE kind of thing...supposed to be a Wealth of KNOWLEDGE...Guess i'm WRONG on that....


                        CAN ANYBODY Help ??


                    • deansongs

                      Re: blocking messages

                      Started failing for me two days back.  But, I had not used it in a while, so I cannot say when the problem *would have* started for me.  That said, all fail, to all addresses, from all email accounts/servers.  Also, I tried plain text and html.  Nothing in this thread is pointing in the right direction for issue I am seeing.  Is it working for anyone?  I am curious because I would like to use it, but have no huge need so I am not putting in a ticket.  Thanks to anyone for any help .

                      • b.deren

                        Re: blocking messages

                        I too started having the same issue.  I have an extensive network system/home automation/live support system at home (IT guy here) and rely on getting security/power outage/system changes, etc notification via my TXT messages on my T-Mobile phone.  I cannot stress how important it is that I don't miss any of them.


                        Well, yesterday I was configuring a new set of APC Smart UPSs with NMCs and email and text notifications were sent int the process.  I tested notifications through management console and everything passed but I never got any messages.  It wasn't until I checked my email that I noticed that except for the initial set, they were ALL rejected.


                            host []
                            SMTP error from remote mail server after end of data:
                            550 permanent failure for one or more recipients (



                        I NEED TO NOTIFICATIONS WITHOUT ANY HICCUPS!!!  Please help

                        • nocebeca

                          Re: blocking messages

                          I have the same issue, and it started  yesterday. I was able to send messages from my Gmail account, but now they come back as Error 550 - blocked. It's very frustrating as I like to send myself notes from my PC to my phone.

                            • magentatechie

                              Re: blocking messages

                              nocebeca, so sorry to hear that you're having issues with your messages!  When you're sending out the messages, are they in plain text (without any HTML)?  Also, it's definitely worth checking to see if you have a block placed on your line.  You can reach out to 611, use the Message Us link on this page, or reach out to T-Force via Facebook or Twitter.  I can't say as to why a block would suddenly appear there, but it's worth a check.  If there isn't a block, you will need to have your rep file an engineering ticket.  Let us know how it goes!

                                • nocebeca

                                  Re: blocking messages

                                  Thanks for the quick reply. I've already checked on my T-mo app on my phone, and there are no blocks. I knew that already as I regularly used to send myself notes. I sent my msg from Outlook in whatever format it is set to, but again that should not be the issue as I sending only reminders (text only). I will reach out to T-Mo if it the issue continues. Thanks again!

                              • abhigarg6

                                Re: blocking messages

                                did you activated digits for the line to which you are trying to send email to text? I have observed that if digits if activated, it immediately starts blocking messages.


                                did you find any solution to this problem?

                                • magenta7504931

                                  Re: blocking messages