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email to tmomail.net rejected for banned content

  • 15 October 2015
  • 71 replies
  • 3617 views

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

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Best answer by tmo_lauren 22 October 2015, 17:29

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71 replies

Userlevel 4

Hooooray! Thanks a million for jumping back in to help out. 😊

So I am getting 550 errors daily from Tmomail servers sending Emails to the SMS gateway for clients who talk to their loved ones via this delivery method. I can send you the SMTP message I received if you want to give me a follow. I attempted to talk to customer support via phone but they were no help and suggested that the receiver of the text must not have any signal at the moment...which I tried to explain wouldn't be the cause of a 550 error but O.K.

Userlevel 3
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LOL sorry about that. Have you tried power cycling your email? JK. I sent you a follow request and you can please send me the details and I will see what is blocking with SMTP 550.x.x

For some reason it won't let me send you a message directly...here is what I can share of the message that I received from one user just two hour ago. I have one more that I received at about 6am this morning as well if you want me to send that one over to you as well let me know.

​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. XXXXXXXXXX@Tmomail.net, ERROR_CODE :550, ERROR_CODE :permanent failure for one or more recipients (XXXXXXXXXX@tmomail.net:blocked)

​Received:from *User IP* by mx.zohomail.com

    with SMTPS id 1496431264006340.7720962637636; Fri, 2 Jun 2017 12:21:04 -0700 (PDT)

Date:2 Jun 2017 12:20:59 -0700

From:24532045@TextConnect.info

To:XXXXXXXXXX@Tmomail.net

Subject:TextConnect

Content-Type:text/plain; charset=utf-8

Userlevel 3
Badge +4

@kameo2k​ I found the specific message in our logs. This particular message rejected by spam filtering due to several reasons. ALL CAPS, missing message IDs, and just the overall language tripped the filter.

Are you the administrator for textconnect.info? There are two issues here.

  1. Due to the variable nature of the transactions between recipients and prison language, this will inevitably trip spam filters. I counted approximately 7 blocked messages out of 212 in the past 7 days, due to an aggregate score count. Not one specific item is blocking the messages, unless it meets a specific criteria. With less than a 3% block rate, this type of block is acceptable.

  2. Lastly, this type of message traffic is A2P enterprise content. Enterprise messaging should truly be sent over shortcode providers and not through consumer P2P messaging gateways. Please refer to CTIA standards section 3.2 regarding the classification of enterprise traffic over P2P gateways and why this class of messaging should migrate to shortcode provider.  ctia.org/docs/default-source/default-document-library/170119-ctia-messaging-principles-and-best-practices.pdf  Textconnect.info is a texting provider for a specialized industry, but interfacing this enterprise traffic incorrectly to a carrier via consumer P2P messaging front-end gateway.

  • Per Cellular Telecommunications and Internet Association (CTIA) Industry guidelines, Inter-carrier guidelines and T-Mobile’s own terms of service, automated commercial SMS traffic routing on any network should use short codes.
  • Commercial trafficking is only allowed through short code, and not through long code (10-digit numbers) and a customer must opt in to receive content.
  • Third-party services can send bulk messages, but such vendors are unaffiliated with T-Mobile and we can't make recommendations. Examples include: Openmarket, 3Ci, mGage, SAP, iConectiv, Vibes Media, Syniverse, CLX.

In summary, this type of texting interface should be migrated to shortcode provider.

Hello,

I am now jumping in here, as I have a similar issue.

I use a Vera home automation controller (GetVera.com).

February 17, 2017 was the last day it was able to send me MMS alerts/notifications using <mynumber>@tmomail.net.

After dealing with the vendor, they ensure me the messages are sending, and state they are unable to provide a bounce, as they reject return messages so  the bounce messages cannot be reviewed. Regardless of their pitfalls, I contacted T-Mobile in march or April. They told me they would open a ticket to discover why the messages were being blocked. I never heard back and was about to give up entirely until I saw this thread.

Here is the data I can provide, since I am the recipient and not the sender:

From Addresses:

noreply1@notify.mios.com

noreply2@notify.mios.com

noreply3@notify.mios.com

noreply4@notify.mios.com

I can tell you, when they send a 4 digit code, from these addressees, to verify my mobile number, I receive that message, however alerts never arrive and I believe are being blocked.

Today, 6-12-2017 at 11:04:46 (Chicago time) I should have received a message looking something like this (GatewayID, Notification ID,Username, and trigger name were scrubbed):

UserID="19"

UserName="MySistersName"

has unlocked door lock

"TheName Of My Notification Trigger" in room

"Foyer"

at 2017-06-12 11:04:46

Gateway ID: 00000000

Notification ID: 00000005691

Any help would be appreciated.

I just checked the providers MX and SPF for the domain specified and it looks ok.

Thank you,

Jon

Userlevel 3
Badge +4

Sorry that you can't seem to get the notifications, but we are not blocking mios.com alarm notifications. Please open a ticket regarding @tmomail.net service and ask for a second look. I can reverse search by recipient number and can tell for certain the timestamp the message arrived and then check SMSC logs to see what happened at the device level.

 

Thanks!

 

That helps!!

Thank you. My wife and I both stopped receiving them around Feb 17.

I can PM you my mobile numbers, unless you prefer I call support, and request another ticket to be opened?

Thanks again for your prompt reply!

Userlevel 3
Badge +4

Send me a follow request so that you can PM me the details. Thanks!

srickar,

Please help. I am an IT professional and receive SMS alerts when systems have problems from a corporate SMTP server of which I have little visibility into. Several of these emails fail (but surprisingly not all). I have followed you in hopes that you can PM me and help with my issue.

Userlevel 3
Badge +4

I sent you a follow request so that we can send a PM to each other.

I am writing an app to send messages to my family members using our tmomail addresses, @srickar. My preferred format is a mime multipart containing text+html, as that method displays my email as the text sender. I'm getting these seemingly random results for 1 to 3 recipients at a time.

  • Sometimes the messages go through just fine.
  • Sometimes, the messages don't go through, but neither do I get any rejection response from T-Mobile. They just seem to disappear into the cloud.
  • And, sometimes, the messages don't go through, but I do get a rejection response saying: 550 permanent failure for one or more recipients (xxxxxxxxxx@tmomail.net:blocked)

If I send the messages as plain text (no html part), they come through 100% of the time; however, they display a random shortcode as the sender. My family then wouldn't know the text is from me without having to read the contents.

The same multipart messages sent to my Gmail account for testing purposes are accepted by Google 100% of the time, with the following in the headers:

spf=neutral (google.com: xxx.xxx.xxx.xxx is neither permitted nor denied by best guess record for domain of me@mydomain)

smtp.mailfrom=me@mydomain

Return-Path: <me@mydomain>

From the spam aspect, I've tried to exclude words in the content that might be considered spammy. Also, I've only attempted to send to 1 to 3 recipients at a time (the max would be 6). With only one recipient, the messages seem to go through more frequently, but still only around 50-60%. I've spaced my attempts so it's clear it's not a "bot" sending a multitude of messages.

Can you advise me on how to create my Content-type: multipart/alternative messages in a way that won't be blocked or ignored by T-Mobile's system?

Thanks in advance for any assistance you can offer!

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Badge +4

Hi Ifolks....send me a contact request and I will do the same. When we are connected, you can PM me the details and I can look in the logs to find the blocked messages. The plain text format part routing through a range of shortcode is expected behavior. Any characters below 360, plain text, no attachment, are redirected by MMSC to SMSC for delivery because it meets SMS protocol. I'll be notified when I get a new request. Thanks!

@srickar​ I just sent you a follow request. We started receiving 550 permanent failure:blocked responses for all messages sent to a tmomail.net address within the last 72 hours. AT&T and Verizon still work flawlessly. I've already checked my domain's spam and DNX lookup scores and no issues reported. We're even registered with emailreg.org. Which I believe T-Mobile uses Barracade spam/virus firewalls who in turn uses emailreg.org as a primary SMTP domain validator.

Userlevel 3
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OK thanks. I accepted the follow and can look into it once the details are shared.

@srickar​ Received follow back. I'm not seeing anywhere that I can send PMs. I don't have a T-Mobile number...

Userlevel 3
Badge +4

The connection status indicates waiting for you to approve the connection. Can you please recheck? Thanks.

Userlevel 3
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Hi @grayfoxtex​  a mobile # is not required in order to follow me here. I rechecked and in order to send PM, it requires that both parties "follow" each other under "Connection Updates".  I have accepted your request.

RELATIONSHIP NOTIFICATION

@grayfoxtex would like to add you as a connection.

4 hours ago

Action taken: Accepted

OK thanks. I accepted the follow and can look into it once the details are shared.

@srickar I have exactly the same issue. I just sent you a follow request too. I started receiving 550 permanent failure:blocked responses for all messages sent to a tmomail.net address within the last 24 hours. AT&T and Verizon still work flawlessly, as well.

I would super appreciate any help.

Thank you in advance. :)

Userlevel 3
Badge +4

OK thanks. I accepted the follow and can look into it once the details are shared.

@srickar I have exactly the same issue. I just sent you a follow request too. I started receiving 550 permanent failure:blocked responses for all messages sent to a tmomail.net address within the last 24 hours. AT&T and Verizon still work flawlessly, as well.

I would super appreciate any help.

Thank you in advance. :)

Thanks for tagging me. Please retest as spam definitions update multiple times per hour as well as spam attacks. If it continues to block, please check for SPF/DKIM/DMARC configuration is setup appropriately. If you still need assistance, please send me a DM with the domain and 1 recipient and I can verify the condition. Thanks!

OK thanks. I accepted the follow and can look into it once the details are shared.

@srickar I have exactly the same issue. I just sent you a follow request too. I started receiving 550 permanent failure:blocked responses for all messages sent to a tmomail.net address within the last 24 hours. AT&T and Verizon still work flawlessly, as well.

I would super appreciate any help.

Thank you in advance. :)

Thanks for tagging me. Please retest as spam definitions update multiple times per hour as well as spam attacks. If it continues to block, please check for SPF/DKIM/DMARC configuration is setup appropriately. If you still need assistance, please send me a DM with the domain and 1 recipient and I can verify the condition. Thanks!

@srickar  Thanks for your reply. I have tried multiple times in the pas 24+ hours and the problem remains. I am sending you a DM with further info. Thanks again!

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