Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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.

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

Thunderbird stopped sending mail

  • 1 reply
  • 0 have this problem
  • 1 view
  • Last reply by Wayne Mery

mdbastron
mdbastron
more options

Using 115.5.2 and macos 13.6.3. Suddenly on or before 12/10/23 Thunderbird stopped sending email. Receiving continues to work. No changes to software recorded (either TB or OS. Have reset all parameters according to ISP (charter.net). Installed Mailspring and it send mail without issue using the same parameters. Have reinstalled TB. I have not discarded all TB files as I have huge archive of emails I cannot loose. Is/Are there specific setting files that I can reset without loosing data?

Using 115.5.2 and macos 13.6.3. Suddenly on or before 12/10/23 Thunderbird stopped sending email. Receiving continues to work. No changes to software recorded (either TB or OS. Have reset all parameters according to ISP (charter.net). Installed Mailspring and it send mail without issue using the same parameters. Have reinstalled TB. I have not discarded all TB files as I have huge archive of emails I cannot loose. Is/Are there specific setting files that I can reset without loosing data?
Attached screenshots

All Replies (1)

Wayne Mery
Wayne Mery
  • Moderator
  • Top 10 Contributor
more options

Such issues tend to be caused by antivirus or the mail provider. Have you seen https://support.mozilla.org/en-US/kb/cannot-send-messages

And have you resolved your issue?