Thunderbird Support Forum

Title. Thunderbird is a really cool client but it's pretty slow. I blame that on the thousands upon thousands of emails that my hotmail and gmail each hold. I don't necessarily want to delete these emails, but I have seldom a reason to have any email older than 2 months in my thunderbird client slowing and crashing the program whenever I want to combine inboxes.

To this end I went to "Synchronization & Storage" and told it to "Synchronize the most recent 2 months" but it didn't delete the huge cluster of older emails. The next option is to tell TB to delete these emails in the same menu but as I understand it that would also delete them in the server, which I don't want to do for posteriority.

What do I do?

This is the message I get when trying to send emails: "Sending of the message failed. An error occurred while sending mail. The mail server responded: pgbentley101@gmail.com recipient rejected. Please check the message recipient "pgbentley101@gmail.com" and try again."

I may have had this answered, but my email issues prevented me from seeing any answer.

I use Thunderbird with my gmail account. When I run Thunderbird on my computer, I don't load any emails (I do get emails on my iPhone). I get this error message: "Authentication failure while connecting to server imap.gmail.com." What does this mean and what should I do?

The page layout and functionality has changed. I keep getting a message about imap! I have not made any changes to anything. It's just not working, i am very lost with it. Help please. John K-D

Since updating to 115.4.1 under Windows 11 (fully updated), Thunderbird regularly (about every 24-48 hours) freezes up and needs to be shut down with Task Manager. What's up??

Just about everything seems slower with 115 from sorting a large column, loading emails at startup, opening an email in a new window, etc. How can I troubleshoot this? thanks, todd

Hello, as soon as TB Thunderbird was auto updated to the new version 115.4.1 (64-bit) 2 weeks ago, it keeps freezing randomly but often for several seconds when you click inbox folders from Any Emails I have: Private, Outlook, Yahoo, or Google.

It does also freeze randomly while I write emails or I check other folders. It take so much longer to deal with emails all together.

It tends to do it if the program has been opened recently but also in the midle of the day or while writing emails, for no reasons.

The previous version was also slower but was at least manageable.

What is going on? Any hints or different solutions are appreciated. Best Regards, Chris

I downloaded the new version of Thunderbird Mail, and now, I'm having continual trouble sending messages (but no trouble receiving them). A pop-up window keeps appearing requiring me to re-sign into my Microsoft account, for some reason, but whenever I press "continue" to sign in, nothing happens, and selecting "cancel" also has no effect. I'm already signed in to my Microsoft account on my laptop, anyway, so I don't know why this window keeps appearing, but I assume it's related to the fact that I'm having trouble sending e-mail. I have to keep closing the Thunderbird program and re-opening it every time I want to send new messages. This is becoming very tiresome. I've already tried closing and re-opening the Thunderbird program, but that doesn't fix the problem. I'm working on a Mac, with the latest iOS. All suggestions appreciated!

Thunderbird was working great until today... you "offered" me an upgrade to SuperNova 115 after which I am no longer receiving any incoming email. Does not even ask me for the password on startup as the old version did. I have checked the Windows Firewall and added Thunderbird.exe. I need help getting this to work or reverting back to previous version. Also, I recently lost a great deal of pop mail from the inbox and would like to know why - it was telling me I could not Compact the Inbox due to not enough space or not having permissions - neither of which should have been a problem. Please don't make me switch to Gmail!! Help......

Get red error when i write email adresses manually in the To field. Only way to put in adresses is first create an entry in the adressbook and then from the adressbook add the emailadress to the email To fields. Thunderbird version 115.4.1 (64-bit)

Hi, I use a old Thunderbird version (38) for Windows Serveur 2003 and I can't connect a Microsoft 365 account. He indicate " A error with login or password" (screenshot in attachment). My password is correct, because it is OK with an other computer with recent Windows and Thunderbird version. I think the problem is with OAuth. Do you have a solution ? Thank you for your support.

Hello, Since the update to Thunderbird Supernova from version 102 upwards, emails in several email folders are automatically deleted or hidden. The properties in the respective folders are listed under Retention rules: Do not delete messages.

The emails displayed in the folders no longer correspond to the contents in the folders. Example: A folder displays: 7, properties in the same folder displays: 1226 with 447 MB. It looks similar in the other folders.

How can I ensure that all available emails are displayed in Thunderbird again?

A repair with *.msf does not help.

Many thanks for your support. Erwin

Hello, I'm using Thunderbird (and before Netscape Messenger) already 30 years. With this new version 115.4.1 (32-Bit) I'm now experiencing the symptom, that, when I reopen one of the mailboxes the focus is not in this mailbox on the last read mail as it was always in earlier versions, it now focusses somewhere so that you always have to scroll to the point where you have been last time.

Hello, Can anyone help with server issues? I'm able to sign in and open Thunderbird but i can not receive or send any emails. It states my server is the issue but i attempted everything i saw online in regards to turning on and off my proxy and firewalls as well as checking the port was 587 for outgoing but its still not working can someone assist me in fixing this.