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Hello, I only use Thunderbird on my PC with IMAP. For the past three days, while I receive my emails just fine, I can no longer send them. They bounce back with the following error message:

The only thing I've done is also install Thunderbird on my mobile phone. It asked me for a password that I don't know and don't think I've ever had one for Thunderbird.

However, when I go directly to the Free Zimbra website associated with my email, it works and I can send my emails. Thank you for your help.

Christian - Error message attached.

I am really in a panic: Using ubuntu 22.04 and Thunderbird 140.7.1.esr For my main account I keep some 40 sub-folders and sub-sub-folders. All but the most recent mails in my sub folders are gone, something like 4 years of email. I asked chatGPT for help and found inside the /mail folder that most of the files with the names of my sub folders with no extension have 0 kb. I don't use IMAPS because I wanted my mails on my computer so I use only POP. :-( The interesting thing is that this only happend to my main account. I have 6 more accounts in Thunderbird and they seem to be fine, at least for now. Thank you for any help. Kind regards Frank

Hello, can someone please fix this e-mail address please & thank you.

Following the instructions provided at this web page: https://developer.mozilla.org/en-US/docs/MDN/Community/Community_Participation_Guidelines I e-mailed a code of conduct violation report to the provided email address, mdn-cpg-report@mozilla.com

Actual results:

I immediately received the following e-mail reply, telling me in effect that my e-mail could not be delivered:

Subject: Delivery Status Notification (Failure) Date: Sun, 15 Feb 2026 21:34:30 -0800 (PST) From: Mail Delivery Subsystem <mailer-daemon@googlemail.com> To: [redacted]

Hello [redacted],

We're writing to let you know that the group you tried to contact (mdn-cpg-report) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:

You might have spelled or formatted the group name incorrectly. The owner of the group may have removed this group. You may need to join the group before receiving permission to post. This group may not be open to posting. If you have questions related to this or any other Google Group, visit the Help Center at https://support.google.com/a/mozilla.com/bin/topic.py?topic=25838.

Thanks,

mozilla.com admins

[headers, etc redacted]

Expected results:

I expected instead to receive a reply telling me that my e-mail had been successfully received.

Dear all,

I would like to use Thunderbird on a shared computer at my universitys lab space (it is mainly my PC but other people have access and use it sometimes). However, as we are requested to keep mails confidential I thought it would be as easy as just setting a primary password and thunderbird would not start if that password is not set. However, that proofed to be a wrong assumption. Instead if I just cancel the dialog it will open and still display all the locally stored mails.

We are using IMAP server and I already set up that the mails are not stored locally. Still, some mails that I have used recently are visible. I am aware that there would anyway be the local copy in the profile folder but I guess none of the people sharing that computer would take the efford to check that, so I would be fine if I could simply prevent thunderbird from starting without the primary password.

Is there any option for that or any extention that would do so?

Thank you in advance! Juergen

Hello, I've just downloaded and started to use Mozilla Thunderbird on my Windows 11 desktop, and have encountered a strange problem. Whenever I compose a new email - it contains a lot of gibberish that looks a bit like a mixture of HTML coding and binary. I've tried changing the format of new emails between HTML and Plain Text and nothing seems to overcome this issue.

 %PDF-1.7

%µµµµ 1 0 obj <</Type/Catalog/Pages 2 0 R/Lang(en) /StructTreeRoot 11 0 R/MarkInfo<</Marked true>>/Metadata 24 0 R/ViewerPreferences 25 0 R>> endobj 2 0 obj <</Type/Pages/Count 1/Kids[ 3 0 R] >> endobj ..... á)S«++Ü>_æcåZ[aCyبµå]$úÌÎñvö¤ãÜ.;[P?°6ø?êæT‡Õ:TêP+;:¶„?p_E¸ïº?\?rc¸¿¿¢2?ð£±ñÓŽ<€‡õÙv¿·ãk†Îû÷z¬§.ê1dÛ¿fBŠ!?™&äKÍÐ7ô?ãóùD_Îé ²?H„Û§VSÚË?¸#,X?¨ +µ"ç?™ã?‰œv™s¤z­ß'–ª²6ú½ºÙ?n_àÍëÙ×¾³ñ|oXÍ©]Pß,¸®±Ã_QAó6£:?¬€?ÖEÇZÙYX€òuµ?Ä"1 S«Ã?þÖp²??€Ã+Ö`Ñôj­J´Z8¹<Ìj룵Â?•?¢_ÞÊŽÚ ê hË?µz??Ôý~g‘×½c?+b5¢?á”r,JNeGuCSØSënÀþlòV»}á` ¦¯Æ_ÝX#VÉo?÷}?óiOÔjalÇ•–…ÅȍÙ&oµâVkÄjÁá­Â‡Ôpdر\ZR¬è¨áÞjîf²?ž?-!Ô1í ¡f—?Yª¨Z>Æí«ñ‘ýH—ÜÑ>é³Ã¦?mÙá8Ò'zÎ?vJ‹?õõV6Vôèà1ê£?Œ¶ö·û©ˆ¹ˆ>?5Lb9ÇÈ,5?'?>?Íh.±Š.o˜MñVû?ý5~ì¡à”j161×ÚúŽŸî??uVµ¶ÚÑ]2ã˜?å—P*Ì|È– ¥?{°*à–˪¥Gké#É1Çe•Ù~ѯŽŽ†N¦f‹­ìîäšÐ—ŸS?ž?¨ñ‡??ü>Ñϼþ&fõͨ-ÇY­B¸óWÕù½voUG]Wwû‚ŽÎ`°£µ²¶y(ÎE‡lC‡zõp·ÖùiÕ?Üëij?Ùx>~Æ(4¥°Q~~ÖÔΠ?kú¬ê]vƼgͨŽ(\)¯?UÓ™…¼ê]^Æ‚šW?^á? ¯Hˆ–¦!aÒÊ»w??k×rušCK×wq¦ùLÒÇY}—B>;=(G{P?·“ú.?å?ei?|&òµSéÜhi?rì"g7SÄ}Kd’u21ÁA³>h Æ?­J¼‚)?®?<»Q6Ž³?V?ÏݝhsšæîâíqA÷.­¥iÑ’í()|íG|è¹(Ö£!<??::‚Ьê?V†öµO”?%?»ÐÕŒ=„÷I¥·Aì¿õ5Í?µ5"z°?ìU|ó0÷`aÅ??=6XÃf㨰Å?JøË„¿Œü?á7bçó?ŽÅ?A·£Ö@Œ?SÍܜΚ*šôvuwϨö=çÞ_ãÃYš?̪?Ç?ðrÓgC¹Ñ?µp?·×׉~°Pµ¨kÌ?[_ƒs)?D‘±á8´??m?%ª´:⼡R=öZ_“p#t´×„k?â¡Õ‹j´ój?³1þ¡aC?µ©Ï??*¨éHô?Ô‚?κ9{‹ 8ôM¯&?I<¬†&ÉhEÏëýȪ¯õÒ?™Ž³L/?³›<ˆùºœF fw4“‰a©Ù–xs8.? ..... trailer <</Size 27/Root 1 0 R/Info 10 0 R/ID[<8A940EF8C93B1F468E504337B8F1ED8B><8A940EF8C93B1F468E504337B8F1ED8B>] /Prev 38146/XRefStm 37845>> startxref 38843 %%EOF </p>

Regards,

 Martin
 martin@baughan.org.uk

My bookmarks suddenly disappeared. I tried to use the troubleshooting guide for "My Bookmarks have Disappeared" bold textbut when I click on <Manage Bookmarks> step nothing happens. Also, when I click on the star to make a bookmark, nothing happens.

I noticed I cannot log on to amazon.ca or shaw.ca anymore on firefox, why?

My Thunderbird email account no longer lets me send out messages. I get a message error

  QUOTE____

Sending of message failed. An error occurred while sending mail. The mail server has responded. Message contains bare CR and is violating 822.bis section 2.3. Please check the message and try again.

But I am able to receive messages.

Can anyone help. Thanks in advance!!

When I try to stream a tv show, I can click on my cable provider, Verizon Fios, to login for access. The sso.verizon.com site doesn't resolve for me to enter my login credentials. I am able to successfully do this on other browsers such as Chrome and Edge. Why won't firefox resolve for me to login to verizon?

i cant export them when i click on the button it open a little window which i then confirm and then nothing happens. if i click the little eyes to see the passwords nothing happens if i click the edit buttons nothing happens. the copy buttons don't work. the only thing that still works is the auto fill.

1. Was able to receive emails sent to my address xxxxxx@xxxxxxx.free-online.co.uk, but unable to SEND my replies. Was getting this notification: 'Send message error. Sending of message failed. An error occurred while sending mail. The mail server responded: Unknown sender. Please verify that your email address is correct in your account settings and try again, OK' (see attached). 2. Checked all settings, all correct as used to be before the problem started. 3. At some stage, I tried changing the password in Settings > Privacy & Security > Passwords > Saved passwords > Saved logins to see if that helped. It didn't. 4. I removed the free-online Server from the Saved logins (Provider: smtp://relay.free-online.net, User: xxxxxxx) with the intention of restoring it with a new password - but found I couldn't restore the free-online server. So I decided the best thing to do was to restore the password as it was before and to ask for help here. >>> That line has now been restored.

NB1. Free-online is a sub section of Plusnet. NB2. Last year I received an email from Greenby saying something about maybe taking over from Plusnet and that I would be notified if and when I had to do anything. I have not received any such instructions so left things as they were. Many thanks for your help from a not-very-techy so stressed old lady.