Email to SMS Problems

meadowsvarsity2000

    I run a small Boy Scout Troop communication list.  I send out weekly email to sms reminders about activities.  Tmobile has blocked the email address I use.  I just got the following from sixteen (16) of my Tmobile users:

     

    -

    The response from the remote server was:

    550 permanent failure for one or more recipients (x@tmomail.net:blocked)

     

    Final-Recipient: rfc822; x@tmomail.net

    Action: failed

    Status: 5.0.0

    Remote-MTA: dns; d79033a.ess.barracudanetworks.com. (64.235.153.10, the server
      for the domain tmomail.net.)
    Diagnostic-Code: smtp; 550 permanent failure for one or more recipients (x@tmomail.net:blocked)
    Last-Attempt-Date: Tue, 11 Apr 2017 16:18:25 -0700 (PDT)

     

    -

    I checked with barracuda and they said I wasn't on their list, it must be on Tmobile's end

    How do I get unblocked?

      All replies

      • drnewcomb2

        Re: Email to SMS Problems

        E-mail to SMS is not considered very reliable. Is there a reason you use that rather than just e-mail?

          • meadowsvarsity2000

            Re: Email to SMS Problems

            14 - 15 year old kids don't check emails.  Group Texts are annoying. It is a fast and easy way to remind kids/parents what is going on with the Scout group that day/week.

             

            It should be reliable.  It worked perfectly, until it was blocked by Tmobile.  All of the other service providers work perfectly.

              • drnewcomb2

                Re: Email to SMS Problems

                Have you tried sending the e-mails one-at-a-time? T-Mobile is pretty aggressive about blocking SPAM and your e-mail's might have been flagged as such. Also, T-Mobile used to market their E-Mail-to-text tools. They discontinued them and only left the e-mail-to-SMS system in place without much support.

            • tmo_marissa

              Re: Email to SMS Problems

              Hey meadowsvarsity2000!  I think email to messaging is definitely a creative way to get a kid's attention - we want you to be able to use it.  Can you take a look at this thread: Text Message via Email and let me know if the suggestions from our engineer to force the message to convert to MMS are helpful? 

               

              - Marissa

              • tmo_marissa

                Re: Email to SMS Problems

                Happy Sunday, meadowsvarsity2000!  I just wanted to stop by and see if you'd had a chance to look over that link or test any of the suggested methods to force the message to deliver over MMS.  How is everything going with your troop communications?

                 

                - Marissa

                • executor-brandon

                  Re: Email to SMS Problems

                  The issue is with T-Mobile and not Barracuda Networks.  I own a text marketing company that sends over 500,000 messages per day in which 100,000 alone are to T-Mobile subscribers. Forcing MMS by creating a message longer than 160, setting the content type to "html/plain" or even including an image will only prevent T-Mobile from "repackaging" your message to a temp short-code for delivery. This will not stop the 550 permanent error. Even if you have the correct SPF, DKIM, PTR (rDNS), SMTP Banner and any extra SMTP IP A records set to your mail server, the failure will continue. What is happening is T-Mobile's SPAM filter (not Barracuda) is seeing your messages as SPAM, if you are using the same subject every time and delivering to just 100 @tmomail.net.net subscribers every 24 hours, you can be blocked permanently.  We resolved our issue by purchasing another TLD (domain) and sending mail through that channel. It was actually a good move because all of our clients access the platform/website through "example.com" but all the mail is delivered through "example-mail.com" but both domains have the same hostname/mail server name of mail.example.com. Hope this helps anyone who has had issues. Remember to use MXToolBox or DNS Stuff to check your IPs, mail server, domain, blacklist, SPF, DKIM, PTR and other records for accuracy.  For those sending a lot of messages per day it's advised you use round-robin IP sending if you have more than 1 IP on your server as well as configuring EXIM in all areas on your server both GUI and command.

                  1 of 1 people found this helpful
                  • bman2018

                    Re: Email to SMS Problems

                    No

                    t mo support told me that t mobile will be getting away from all Email to SMS as it is " OLD TECH"