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J

New Member

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2 Messages

Tue, Jan 18, 2022 10:20 PM

txt.att.net 405: Service Temporarily Unavailable

The txt.att.net and mms.att.net gateways have been failing with error 405: service temporarily unavailable.  I provide a service that sends notifications via e-mail to SMS gateways, and as these notifications are time-sensitive, this poses a problem for my users who use AT&T as their carrier.  My mail server is not on common blacklists  and does not spam; the notifications are opt-in by the user.  Please advise how this can be fixed.

ATTHelp

Community Support

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195.8K Messages

7分前

Lets get you pointed in the right direction for postmaster help @jroehr.

 

This error means the service is temporarily unavailable and you will need to try again at a later time.

 

Below is a list of AT&T Email Best Practices:

  • Follow any relevant Requests for Comments (RFCs).
  • Check if your message complies with the Federal Can Spam Act of 2003.
  • Send email through your ISP’s mail servers. If you use dial-up or other dynamic IP addresses, your email might not work.
  • Avoid sending a lot of emails all at once.
  • Remove your IP address from any Real-time Blackhole Lists (RBLs). If you’re on one, contact the list’s manager.
  • Don’t send email from an IP address where the sender changes often.
  • Use appropriate header information. You can check yours by viewing the raw version of a sent message.
  • Don’t try to find email accounts by sending mass messages to spam our server. We’ll block these emails and may take legal action.

If you are still needing further help you can reach out to our specialized team for Postmaster Help.

 

We hope this helps! Thanks for contacting AT&T Community Forums.

 

Samantha, AT&T Community Specialist

New Member

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2 Messages

7分前

Hi Samantha,

I believe I'm in compliance with most of the above, the notable exception being "avoid sending a lot of emails at once".  Due to the nature of my service, when I receive updated data I may need to send a large number of e-mails to a large number of users in a short window of time.  That said, the e-mails are not spam, users voluntarily opt-in to receiving them, and they can disable receiving the e-mails at any time.  Is there some way I can have my mail server whitelisted as a non-spammer who may nevertheless send a large number of messages in a fairly short window?

On the page you linked, I don't actually see a way to contact a specialized postmaster help team; it appears to be a general FAQ page.  How can I get in contact with this specialized postmaster help team?  Thanks.

(edited)

ATTHelp

Community Support

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195.8K Messages

7分前

Thank you for your response @jroehr.

 

Since you are sending a lot of emails at once you may be getting blocked on our network from sending emails out.

 

Under the article previously mentioned you can reach that team by clicking on "contact us about our email block list". This will open up for you to be able to email the team who helps with Postmaster concerns. As well, their email address is abuse_rbl@abuse-att.net.

 

This should help with getting your mail server whitelisted to be able to send emails. Thank you for contacting AT&T Community Forums.

 

Samantha, AT&T Community Specialist

Contributor

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1 Message

2分前

Hi, jroehr.

Did you ever get this resolved?

I have the same problem, and I am not getting any responses from the ATT Postmaster emails. Phone support also gets me nowhere.

When I am sending email to text from one of my "service" emails, it gets delayed (up to 12h so far) when I send from a personal mail (same domain) it goes through immediately.

When I check the message trace from Exchange, I see something like this "Service temporarily unavailable};{MSG=};{FQDN=mx3b.txt.att.net};{IP=166.216.152.132};"

I also think I am in compliance with most, but I also send a lot of emails due to the nature of my service (Similar to you, notification system that users opt in to)

If ATT could just tell me what compliance I am breaking or what is going on, then I could perhaps fix it

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