Thunderbird Community Forum

I deleted an old email address for a friend, but every time I email her, the auto-complete feature includes both the current email address and the one for her old job. I've deleted that one, and it doesn't seem to show up in the Address Book anywhere, so why does it keep coming up in the auto-complete?

It's annoying to me and to the place of employment to have the emails go to the wrong address when I'm not watching very carefully.

How can I make sure this doesn't happen again?

I have the latest Thunderbird update. Since yesterday, using imap.comcast.net, I have been getting the error "Login to server imap.comcast.net with username [removed] failed." It wants me to retry or enter a new password. I cannot get emails. I can, however, log into my Comcast email account online and see emails delivered. Thunderbird, of course, will not receive these emails.

For imap.comcast.net, port is 993, connection security is SSL/TLS, and authentication method is normal password. I have not changed any of these settings. I have not changed my password. I have done nothing to cause the problem.

I cannot find a solution online. Could someone help? Thank you!

Mein Betriebsystem WIN 11 Free-E-Mail bei Telekom Eingegange E-Mails werden auf dem Server von T-Online nicht gespeichert und auf meinem Thunderbird nicht im Ordner Posteingang sondern im Papierkorb vom Lokalen Ordner nicht im Posteingangs. Auf dem Handy werden Sie angezeigt und können gelesen und Bearbeitet werden. Beim nächsten öffnen der E-Mail App werdenSie gelöscht.

Welche mögliche Ursachen gibt es dafür.

Thunderbird somehow only syncs some events on some weekdays from one of my calendars. One event of two on tuesdays shows up, all events on mondays don't show up. These are similar events each week. It seems to be syncing all events from a different calendar on the same account from the same server.

As so many have experienced, but I have yet to find the actual solution, I will bring up the issue.

I recently purchased a new computer. Installed Thunderbird, created all the mail accounts I have and... no problems. All the accounts, once created, populated with emails. For 3-4 days, there were no issues.

Important to note: I let TB use all the default settings. And once everything was up and running >>>>I did not change anything<<<<<.

Then a few days later, I started getting the following messages for two accounts that had migrated from q.com to myctl.net. Entering the 100% proven-correct password results in the know endless-loop of entering the password and the same pop-up error message. The PW is 100% correct as I can go to Centurylinks' website and login using that same, exact password and read my emails.

I've spent enough time trying all the suggestions here, reddit, facebook etc so I'd thought I'd see if anyone has actually found a solution.

Bonjour,

Depuis plusieurs semaine ce problème survient.

"Le certificat pour imap.gmail.com:993 ne provient pas d’une source sûre".

Ce problème, uniquement sur l'ordinateur avec windows 11. Sur le GSM pas de problèmes.

D'avance merci pour votre réponse. Cl. BERNARD

Courriel: nonpub57@gmail.com

Hello,

This problem has been occurring for several weeks.

"The certificate for imap.gmail.com:993 is not from a trusted source."

This problem only occurs on my computer running Windows 11. There are no problems on my mobile phone.

Thank you in advance for your reply.

Cl. BERNARD

Email: nonpub57@gmail.com

Hi, The goal is download attachments from a RSS feed. I set a specific folder so i don't have to select path for every single file. Then clicking on the file link and it should start to download but it is very unreliable especially when used on many files in sequence it silently fails. Related big problem is absence on any useful file transfer indicator like Firefox has. There is a "download manager" tab but it is completely useless. It does not show any progress and the view has no scroll bar so nothing useful can actually be seen there. Downloading using "save as" button works. So you should either fix the direct link download or disable the feature completely until it does work, to avid missing files, because that is the worst outcome.

hi all. if i create a new blank Task it automatically pre-selects today's date as the start date, and if i create a Task from an email it sets the date the email was received as the start date. i know can filter tasks lists, and hide columns, but the real issue is how it looks on the calendar; with the fixed start date, setting a due date in a month's time results in a fixed, ongoing task for a month. is there any plugin or setting that will just stop TB setting a start date that i can't change, or letting me explicitly set it myself?

thunderbird is not sending or receiving email to a particular legitimate email address; never had this problem in the past--it's just one particular email--please stop blocking it; @inreach. garmin.com

I like to sort my mail using the menu functions

Message-MoveTo-RecentDestinations

Unfortunately, for some time now, the "Recent Destinations" list remains very small and most folders, regardless of how recently I moved messages to them, do not show up on the list.

I have tried quitting TB, deleting folderCache.json, but that makes no difference. The list stays the same, and it does not get updated for most folders.

Maybe that approach is no longer a panacea :-) and there is some other way to fix this?

When checking for new email a pop asking for the username and password of the for the email server. Also when a separate email client is downloaded. This only happens when. using a mac book pro. No problem when. using Ubuntu.

Hi. Since the Thunderbird update in March/2026, my Bell sympatico.ca email is no longer able to send emails out through Thunderbird. No error messages but emails never get to destination (I tried sending to myself on both gmail and sympatico accounts). I receive emails without issue. I tested the sympatico from the web or my iPhone and it works. Seems something changed in T-bird back in March?

I validated the Outgoing SMTP server settings and all seems OK (See attached file for screenshot of settings). Any idea why and what changed to cause this?

Tx, Robert Ziwani

I've been trying to connect for over an hour and I always get the answer; " Connection to the server impossible. The configuration, username or password are probably incorrect. My access provider is “Orange” and I made the mistake of accepting “Unlimited Emails”, I have 650,000… I work on a MacBook Pro Apple M1 Pro 26.3.1 (a) and the Mail app is very saturated and Tchat Gpt advised me to use your “Thunderbird” app I changed my Orange access password about 4 hours ago. Please guide me towards making your application work properly.

When I try to install my account Office 365 for my association's account (XXXX@patapon95.fr) it doesn't word with Thunderbird (I can connect on Outlook on the same account). I can also connect with my personnal acount on xxxx@outlook.fr on Thunderbird.

突然、どこにもメールの送信ができなくなってしまいました。 受信はできます。 KDDIを使っていますが、問い合わせしましたが、サーバーに問題ありません。 Webメールでは送信できます。 Thunderbird側の問題のようです。 添付のようなメッセージが表示されエラーになってしまいます。 解決策を教えてください。

Suddenly, I can no longer send emails anywhere. I can still receive emails. I use KDDI, and I contacted them, but they said there are no issues with their servers. I can send emails using webmail. It seems to be an issue with Thunderbird. The message shown in the attachment appears, and I get an error. Please let me know how to fix this.

Changed p/w as solution no help Today for some reason Thunderbird won`t download from xfinity. Worked well yesterday,been on phone with xfinity about 1 hr. or so. restart pc no help

Hello,

In my Thunderbird Profiles folder, I can drill down to ImapMail. I see multiple subfolders prefixed with my imap server name. eg:

- imap.server-5.com 10.85GB - imap.server-3.com 8.83 GB

and so on. The datestamp on each is different.

Within the two examples above is a large Inbox folder taking up ~8.8GB.

The size doesn't concern me as much as the fact of having two of these. I'd like to understand what Thunderbird is doing under the hood here. Does it create new imap.server-#.com folders periodically as backup/recovery folders?

I'd like to recover space where possible but if these are protective measures, I could live with that. However, if it creates future folders and replicates 8+GB of data multiple times, I'd like to know what steps I can take to free up disk space.

Thanks,