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E-mail to SMS being blocked due to suspected SPAM

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A

Hello @srickar​​  I seem to be having the same problem as others. It seems like it started Friday evening, and I've checked that we are passing SPF, DMARC and DKIM checks in the headers. It's only happening with tmomail.net and mymetropcs.com (which I believe is an MVNO through you guys) no problems through att, verizon, sprint etc.

Created Date:

10/22/2019 3:19:54 PM

Sender Address:

Info@answernational.com

Recipient Address:

XXXXXXXXXX@tmomail.net

Subject:

Your Messages


Error Details

Reported error:

550 5.7.350 Remote server returned message detected as spam -> 550 permanent failure for one or more recipients (XXXXXXXXXX@tmomail.net:554 rejecting banned content)

DSN generated by:

DM6PR19MB2489.namprd19.prod.outlook.com

Remote server:

mx207.us-east-2b.ess.aws.cudaops.com

Any help you can give is greatly appreciated.

srickar
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@ansnat​,

Did you check today? They are passing as I had made some changes yesterday 10/22 around 1230pm CDT. Please note that email could be blocked again due to matching with spam activity that's ongoing.

Reason was due to spam storm that's also using info@. It would be best to avoid using generic usernames that match with spam activity. Examples would be info@, postmaster@, admin@, test@, etc which are too generic but used by spammers which will cause your traffic to get lumped into same category. Unfortunately, spam attacks are heavy right now and can result in false positive blocking. Thanks for your understanding.

srickar
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Just informing everyone that I will be out of office October 24th and 25th and will have limited ability to answer messages. I shall return on Monday Oct. 28th. And of course you may always contact T-Mobile TEXperts at 611 and submit a ticket for @tmomail.net if you are experiencing issues with email delivery. Thanks.

M

Hi @srickar​.

Did you see my post above? I saw you try to 'connect' and I accepted, but I see no response above or in my Inbox. (Was it something I said, as opposed to others?)

A

@srickar​ I just checked, and they are going through now.  Thank you so much unfortunately I'm stuck with generic email names Info, messages, accounting etc.

Thanks again.

M

Hi @srickar. On our Inbox back and forth, you quickly unblocked Mindspring, and I think you took off. I wrote back quickly we were using SendGrid. When you get this, can you check back with us (even if it is next week at this point).

J

Hi @srickar

I have a similar situation but its a bit different. We use an smtp Client to connect to a gmail account that sends the email.

For some reason the manual email doesn't get blocked but the email through the smtp client does.

I tried this from another smtp client on another pc as well and was still getting blocked.

Can you tell me what exactly is the banned content? If anyone else has any ideas please let me know.

I black out some parts for privacy concerns but I can dm you the full details.

srickar
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Hi @jpipvideo​

I found the message based on the power of * search. 😊

You have an empty "Envelope From:" field which is a requirement for SMTP acceptance.

Please configure the sending server to have this and it will pass.

One more item to note, you have an email address with test@. That is currently not allowed because of the generic nature due to a spam storm right now posing as officially titled user names. (test@, admin@, webmaster@, postmaster@, administrator@, etc).

J

giphy.gif

Thanks @srickar​. I believe it worked. I just used test2 instead of test 😀.

For anyone else wondering your sender has to be the same as the true sending address. email to tmomail.net rejected for banned content

"IMPACT: Customers may be unable to receive messages to messages to their MSISDN@tmomail.net address. To help aid the attack against SPAM, T-Mobile is now blocking traffic where the sending Domain is altered from the true sending address: IE support@customerservice.com, when the domain is actually is support@gmail.com. senders will receive a 550 bounceback error . To correct this issue, Senders will need to revert their sending address to their actual email address. For assistance, direct customers to the sending party, and sending parties to their domain customer support. this service is functioning properly."

T

Thanks, @srickar.  Is there any way that we could have a particular address whitelisted so that texts with URLs are not flagged?

V

Hello! We are having the same issue and could use some help with this. I was able to receive email to SMS on my tmobile device until just recently. I was testing a new service we intend to provide to our customers as we have an online auction site and customers would like to sign up for a outbid notification. Please note that they have to sign up for this service. We can send to ATT and Verizon and other carriers but get this bounce back from Tmobile.

The email is coming from an info@ourdomain.com

XXXXXXXXXX@tmomail.net

    host d79033b.ess.barracudanetworks.com [209.222.82.126]

    SMTP error from remote mail server after end of data:

    550 permanent failure for one or more recipients (XXXXXXXXXX@tmomail.net:554 rejecting banned content
We will try changing the from / sender email and see if that helps - if not what do we need to do to get our domain white listed?

M

Hi srickar,

I have the same problem as everyone else. I have emails of shopping deals from a website (slickdeals.net) that gets sent to my gmail. I have a gmail rule that forwards these emails as SMS messages to me at xxxxxxxxxx@tmomail.net. But recently, the messages have not been getting sent to my phone and I get an error email from Gmail, pasted below. Any help is much appreciated. Thanks.

Message blocked
Your message to xxxxxxxxxx@tmomail.net has been blocked. See technical details below for more information.
The response from the remote server was:
550 permanent failure for one or more recipients (xxxxxxxxxx@tmomail.net:554 rejecting banned content)
M

Hi,

I am having the same problem.  We are an alarm company where our alarm panels send out email-to-SMS messages to our customers.  T-Mobile is now blocking 550 our emails.  We need to get our domain white listed as well.  I opened a support ticket, # 25596751, today by phone, but they really didn't seem to understand my problem.  I'm really hoping to get white listed as our customers with T-Mobile can't receive any alarm notifications right now.  All other carriers receive the messages without any problem.

-Greg

srickar
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Greg,

Id like to look into this further. I could not locate a sending domain to the # listed in the ticket. Can you please follow me back through inbox and send me a direct message? Thanks.

H

Hi @srickar,  I'm having the same issue as everyone else.  I sent you a follow request.

srickar
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Hi @hiddensoundhostel​

That issue is quite different from other examples. In this case, double relay forwarding is not permitted because proxy forwarding of spam also utilizes this method. The purpose of double forwarding allows for spamming entities to circumvent direct detection using webmail providers that cannot be outright blocked. If sent directly, the messages will pass.

V

I am having the same issue - can you assist? I sent a message - maybe I am not doing this correctly - but I sent this message -

Hello! We are having the same issue and could use some help with this. I was able to receive email to SMS on my tmobile device until just recently. I was testing a new service we intend to provide to our customers as we have an online auction site and customers would like to sign up for a outbid notification. Please note that they have to sign up for this service. We can send to ATT and Verizon and other carriers but get this bounce back from Tmobile.

The email is coming from an info@ourdomain.com

XXXXXXXXXX@tmomail.net

    host d79033b.ess.barracudanetworks.com [209.222.82.126]

    SMTP error from remote mail server after end of data:

    550 permanent failure for one or more recipients (XXXXXXXXXX@tmomail.net:554 rejecting banned content
We will try changing the from / sender email and see if that helps - if not what do we need to do to get our domain white listed?

G

Try using something besides info@ourdomain.com<mailto:info@ourdomain.com>. Info, Webmaster, Postmaster are blocked because of spam.

H

Hi @srickar​, I changed it so my email account forwards the email directly to my phone via text message (instead of forwarding the email to another email account that then forwards the email to my phone via text message).

I'm getting this message now:

"Message blocked.  Your message to [my number here]@tmomail.net has been blocked. See technical details below for more information. 

The response from the remote server was:  550 permanent failure for one or more recipients ( [my number here]@tmomail.net:554 rejecting banned content)"

Is there something else I need to do?

Thanks!

srickar
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Send me an inbox follow request and I can investigate more closely. Thanks.

V

@srickar​   How can I get a message to you - I have the same issue?

T

@srickar​ my team wanted to know if it were possible to add a particular whitelist our carehere.us domain for the survey or sending email address that flag our email? 

srickar
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No sorry, cannot whitelist external entries. The reason certain messages are blocking is due to sending out survey links for .us TLD. This is a common spamming tactica which these messages are similar. This type of solicitation ideally should be routing over a subscription shortcode based service as these emails are sending out solicitation asking recipients to click links.

M

I think I sent the inbox follow request, but I don’t see a way to send you additional informantlion.

M

@srickar

Not sure if you did anything but everything now works with forwarded emails to SMS from slickdeals.net. Thank you.