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Email to SMS (tmomail.net) is blocking our domain for spam.


I work for a local fire department, which uses the phonenumber@tmomail.net gateway to alert members of the fire department with (T-Mobile service) of emergencies/disasters. We use similar gateways from other carriers for those respective members, and they are without issue at this time. This system from T-Mobile has worked flawlessly for the last 2 years, until recently, which we are now getting bounced by the server and getting the mail messages kicked back with the following error (X's represent the member's phone number):

mx197.us-east-2b.ess.aws.cudaops.com gave this error:
permanent failure for one or more recipients (XXXXXXXXXX@tmomail.net:blocked)

i've tried sending messages individually, and even sending out messages as MMS, and I'm still getting bounce backs.

I see "srickar" on this site answering questions, as the spam admin for tmomail.net, and I was wondering if they'd be able to point me in the right direction.

Not only am I the one handling this issue... I'm also a T-Mobile user, and am one of the end users effected by it.

Thanks for any input.

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Best answer by srickar 29 April 2021, 15:50

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Hi @Luicien let me look into this. Can you please send me a D.M. with the domain and recipient info? I can check on potential reasons and provide guidance. Thanks.

Hello @srickar 

I have had this problem for months now.  I have had two support tickets submitted which did not resolve the problem.  The first ticket response simply said that there was not a problem and that the text messages were being sent through.  This of course was not the case so I again called customer support who submitted another ticket.  The response to this ticket was that GoDaddy had to update its system.  I asked what specifically needed to be changed and the rep did not have that info.  I called go daddy and asked if their email servers were up to date and of course they said yes and that they could not help me resolve issues with third party’s (T-Mobile)  blocking my emails.  Believing the issue lied with GoDaddy I moved my email hosting to Dream Host.  After moving my email hosting I tried to send an email to my own text number and it was blocked just as it had been before with GoDaddy.  I did more research and found something about the internal document DOC-414999.  This prompted another call to T-Mobile customer support.  I mentioned the internal document and was told that my emails were being blocked because my email address started with info@ followed by my company domain.   I was told that If I wanted to fix the problem I would need to change my email address to one that did not start with any number of generic things like info, contactus, etc.  This is the same email address I have had since 2011 which is on all of my printed marketing materials and has worked with text messages until just a few months ago. I would also add that the email to Verizon text works just fine. I also made sure that the blocks were not related to the content of the emails by sending various messages, all with the same results.

Is there any way to get this problem solved without having to change my email address?

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srickar,

Can you help us with some messages that were blocked? We tried to sent an email to text notification regarding an outage to our employees and all of the tmomail.net messages were blocked as spam.

The message was “ProgramName1 and ProgramName2 currently down. Will update as more information is available.” with a subject “Some Services Down” from an actual users email rather than a generic “info” or “support”.

Thanks,

J

Hi @dangomango 

Please send me a PM with details and I can discover why its blocked. Most envelopes are blocked because of DNS restrictions set up by the domain owner for SPF/DKIM/DMARC.  Thanks.

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I’m having this problem and would love to get some help @srickar srickar on how to fix this!  Thanks. 

Hi @stacyb 

Please send me a PM and I can investigate the block reason. Thanks.

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Hello @srickar,

I am experiencing the same issue with sending emails to mytmobilenumber@tmomail.net.

The sending email address is Microsoft Azure <azure-noreply@microsoft.com>.

Is there a way to whitelist the Microsoft domain?

Or can the email address be whitelisted?

We use alerts from Azure to send to our cell phone for after hours on-call situations.

I have also been in contact with Microsoft and currently they are not able to change the email address.

Appreciate any help or insight you can provide.

Thanks!

I responded to your PM and to remind myself here that we have an ongoing conversation. Due to the configuration, it will require either change in the envelope to accommodate Microsoft restriction on DKIM/SPF/DMARC.

 

Thanks.

I’m having this problem and would love to get some help @srickar srickar on how to fix this!  Thanks. 

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Hello @srickar,

I am experiencing the same issue with sending emails to mytmobilenumber@tmomail.net.

The sending email address is Microsoft Azure <azure-noreply@microsoft.com>.

Is there a way to whitelist the Microsoft domain?

Or can the email address be whitelisted?

We use alerts from Azure to send to our cell phone for after hours on-call situations.

I have also been in contact with Microsoft and currently they are not able to change the email address.

Appreciate any help or insight you can provide.

Thanks!

Hi @darockk 

Sorry we cannot whitelist external domains. Please send me a PM and I can investigate further. Envelopes like azure-noreply@microsoft.com are widely configured and the sender envelope is cosmetic purposes only.

Hello @srickar,

I am experiencing the same issue with sending emails to mytmobilenumber@tmomail.net.

The sending email address is Microsoft Azure <azure-noreply@microsoft.com>.

Is there a way to whitelist the Microsoft domain?

Or can the email address be whitelisted?

We use alerts from Azure to send to our cell phone for after hours on-call situations.

I have also been in contact with Microsoft and currently they are not able to change the email address.

Appreciate any help or insight you can provide.

Thanks!

srickar,

Can you help us with some messages that were blocked? We tried to sent an email to text notification regarding an outage to our employees and all of the tmomail.net messages were blocked as spam.

The message was “ProgramName1 and ProgramName2 currently down. Will update as more information is available.” with a subject “Some Services Down” from an actual users email rather than a generic “info” or “support”.

Thanks,

J

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Our service is also experiencing the same issues. We used to have the 554; banned content every now and then but recently the entire domain has been blocked, even for new accounts verification.

Having same exact issues to my number from home automation system. Really relay on this. 

@srickar Would love your assistance with this issue as well. I use xxxxxxxxxx@tmomail.net to forward emails from specific senders to my phone (so I am aware of them immediately.) It’s crucial that I receive these in a timely fashion, but am now not receiving them at all. Any help would be appreciated, any further info you’d need from me? Thanks!

Hello,

I’m having this same issue. I’m sending individual text messages from my personal gmail account and it works great for all other Mobile Providers, but it’s getting blocked for Tmobile. Can someone help with diagnosing the issue?

I have this problem too.  System failures are sent from our domain hosted at Office 365 and are always blocked.  I have another domain where sometimes they get through and sometimes blocked.  Need some way to whitelist domains so they are never blocked.  I called TMobile service and they said the only thing they could do was remove SCAM ID, but that hasn't seemed to help.  I think that is for calls, not messages.

Not sure if this could help anyone, but it has worked for my company. When adding the group of contact numbers to the email to send through the sms gateway- the sender placed the contacts under the “BCC” section of the email. This then sent the message to each person in the group individually and the messages are now being received by T-Mobile users. We have roughly 100 people in our contact groups- and the sender doing this has finally seemed to fix our issue.

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Hi @srickar - We are having the same problem receiving a 550 permanent error blocking email messages at mx-inbound46-105.us-east-2c.ess.aws.cudaops.com to 10digitnumber@tmomail.net. Our whole IT team receives server alerts and is having the same issue. Any help will be greatly appreciated. Thank you.

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

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Hello, Is this thread still active?

Or is there another source to get this particular issue resolved?

 

Thanks,

AR

 

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

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I am having the same issue. I was on the phone for 45 minutes to no avail. The tech support said they’d call me back within 24 hours. Never heard back from them and I am still haveing the same issue. 

 

This is the message I get back every time:  

Delivery to the following recipients failed permanently:

 

   * 785979XXX@tmomail.net

 

Reason: Delivery to 209.222.82.255 failed. Return Code: 550; Return Message: 550 permanent failure for one or more recipients (785979XXXX@tmomail.net:blocked)

 

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

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Hey! I have a raspberry PI at home that has been sending out emails/(SMS Messages) to my Tmobile phone for years and all of a sudden about a week or so ago it no longer works.  My PI still sends emails to my other email addresses, just not the phone.  I am sending it using postfix and relaying through my personal domain email account. Is Tmobile blocking certain domains now?  I can send an email directly from my email client, just not through the relay. Does Tmobile need to whitelist my home IP address?  I contacted support but they had no idea what I was talking about.  Thanks in advance. 

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

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Any updated on this? This suddenly stopped working for me last week

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

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Hello @srickar  We use email to text for monitoring alerting and other notifications.  This has been working for years.  Suddenly, earlier this month, in one of three datacenters email to text stopped working.   The postfix mail server has the following error message:

Mar 18 19:04:07 xxxxxxx-xxxxxxx postfix/smtp[85822]: 60E961A002B: to=<xxxxxxxxxx@tmomail.net>, relay=d79033b.ess.barracudanetworks.com[209.222.82.253]:25, delay=5.7, delays=0/0/1.6/4.1, dsn=5.0.0, status=bounced (host d79033b.ess.barracudanetworks.com[209.222.82.253] said: 550 permanent failure for one or more recipients (xxxxxxxxxx@tmomail.net:blocked) (in reply to end of DATA command))


We have a QA data center using .net domain, US data center using .com domain, and an EU data center using an .eu domain.   I am able to send an email to text and receive the text from the QA and US data center. I am not able to receive any text messages from the EU data center.  As mentioned, this was working correctly and suddenly started failing.

================

I have been placed back into this support role due to overwhelming demand. Please send me a PM with these details not redacted, and I will look into this. 

Hello @srickar  We use email to text for monitoring alerting and other notifications.  This has been working for years.  Suddenly, earlier this month, in one of three datacenters email to text stopped working.   The postfix mail server has the following error message:

Mar 18 19:04:07 xxxxxxx-xxxxxxx postfix/smtp[85822]: 60E961A002B: to=<xxxxxxxxxx@tmomail.net>, relay=d79033b.ess.barracudanetworks.com[209.222.82.253]:25, delay=5.7, delays=0/0/1.6/4.1, dsn=5.0.0, status=bounced (host d79033b.ess.barracudanetworks.com[209.222.82.253] said: 550 permanent failure for one or more recipients (xxxxxxxxxx@tmomail.net:blocked) (in reply to end of DATA command))


We have a QA data center using .net domain, US data center using .com domain, and an EU data center using an .eu domain.   I am able to send an email to text and receive the text from the QA and US data center. I am not able to receive any text messages from the EU data center.  As mentioned, this was working correctly and suddenly started failing.

Any updated on this? This suddenly stopped working for me last week

Hey! I have a raspberry PI at home that has been sending out emails/(SMS Messages) to my Tmobile phone for years and all of a sudden about a week or so ago it no longer works.  My PI still sends emails to my other email addresses, just not the phone.  I am sending it using postfix and relaying through my personal domain email account. Is Tmobile blocking certain domains now?  I can send an email directly from my email client, just not through the relay. Does Tmobile need to whitelist my home IP address?  I contacted support but they had no idea what I was talking about.  Thanks in advance. 

I am having the same issue. I was on the phone for 45 minutes to no avail. The tech support said they’d call me back within 24 hours. Never heard back from them and I am still haveing the same issue. 

 

This is the message I get back every time:  

Delivery to the following recipients failed permanently:

 

   * 785979XXX@tmomail.net

 

Reason: Delivery to 209.222.82.255 failed. Return Code: 550; Return Message: 550 permanent failure for one or more recipients (785979XXXX@tmomail.net:blocked)