This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Sending email. mail server responded: <END-OF-MESSAGE>: End-of-data rejected: user smtprelay service AUP suspended

  • 8 cavab
  • 1 has this problem
  • 45 views
  • Last reply by david

more options

cannot send email. Can receive email fine. l cannot respond, forward, or send new email. I checked settings, and they seem to be correct. It suddenly started this a few days ago. When sending, icon indicates sending, but get this box:

"Sending of the message failed. An error occurred while sending mail. The mail server responded: <END-OF-MESSAGE>: End-of-data rejected: user smtprelay service AUP suspended. Please check the message and try again."

Now what?

cannot send email. Can receive email fine. l cannot respond, forward, or send new email. I checked settings, and they seem to be correct. It suddenly started this a few days ago. When sending, icon indicates sending, but get this box: "Sending of the message failed. An error occurred while sending mail. The mail server responded: <END-OF-MESSAGE>: End-of-data rejected: user smtprelay service AUP suspended. Please check the message and try again." Now what?

Modified by Wayne Mery

All Replies (8)

more options

This appears to be an error in the SMTP server configuration, such as possibly an incorrect email address for the account, but could be other reasons. If you share a screenshot of SMTP settings, someone here may have suggestions.

more options

Below, is what I have: (see image below)

more options

In account settings, look down left side to 'Outgoing server (SMTP). Click that and do a screenshot. That will show the smtp settings. Thanks.

more options

This is what it says:

more options

Try changing authentication to STARTTLS with normal password and see how that goes.

more options

No change.

more options

Hi, were you able to solve this problem? I have the same Problem at the moment and would appreciate any help there is.

more options

You seem to have two SMTP servers. I suggest creating a unique description for each and verify which is being used. Be sure you are authenticating with it.