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

Unable to send message

  • 1 cavab
  • 2 have this problem
  • 1 view
  • Last reply by Zenos

more options

Alert Message An error occured while sending mail. The mail server responded 5.7.1 The message contains an unauthorized custom from address because the 5.7.1 associated account has been disabled or deleted. Please revalidate. 5.7.1 the custom from if you believe this to be in error. q2sm8373328wia.19 - gsmtp. Please check the message and try again.

Alert Message An error occured while sending mail. The mail server responded 5.7.1 The message contains an unauthorized custom from address because the 5.7.1 associated account has been disabled or deleted. Please revalidate. 5.7.1 the custom from if you believe this to be in error. q2sm8373328wia.19 - gsmtp. Please check the message and try again.

All Replies (1)

more options

So it looks like you're trying to send using a from: address which appears to have been removed, disabled or retired.

The message is from a server. You need to check if all the addresses offered in Thunderbird as from: addresses are current and valid.

But now I see other posts saying pretty much the same, which has me wondering if this is a problem at the server.

Who is your mail provider?

https://support.mozilla.org/en-US/questions/1014299

Modified by Zenos