Thunderbird Support Forum

Starting a few months ago Tbird suddenly became noticeably slower, and it's only continued/possibly gotten worse, despite several version updates (which I was hoping would fix it). Currently I'm on version is 115.12.1 (64-bit)

I do have several accounts (all pop) and many folders, but nothing different than before the issue began.

I only have 2 add-ons enabled; Remove Duplicate Messages & SmartTemplates. I've of course disabled them and restarted TBird but it didn't help at all.

I've compacted and repaired all folders.

I've created additional folders to reduce the size of larger folders.

The only thing that helped a bit was troubleshoot mode, which definitely made it a bit better going from email to email and folder to folder, and especially with moving emails from one folder to another (which is usually very, very slow and I see it on the bottom saying "moving email 1 of 10 to folder xyz...moving email 2 of 10 to folder xyz...", even if they are simple/small emails). However, sending emails still took over 5 seconds (see screenshot attached), so that might be a separate issue.

In terms of sending emails, whenever I try to send any email it sits on the sending screen for several seconds or more. My internet is fine (2gb fiber, previously 1gb cable), speed tests max out at the 1gb my laptop can handle. Laptop is 2-3 years old high-end Eluktronics, with no other issues.

Given the above, and that troubleshoot mode did seem to help a bit (but straight out turning off add-ons didn't help), what can I try to adjust (while not in troubleshoot mode)?

Thank you very much!

Its driving me crazy. When I select a group of Inbox emails, and delete them, it is taking forever. The window will display a "not responding" message, eventually clear that and then the emails are deleted. But it takes way too long. Windows 11, most recent update. Thunderbird, it just updated. I was on a Win 10 computer, same Thunderbird version and deleting took merely a blink to happen.

Win 10 has both VPN AND AV. Win 11 has neither. Help! Thank you,

Have used Thunderbird for 10+ years, as interface to Gmail. Lovely product. 3 days ago I had to reinstall a station but when Thunderbird does its updating after reconnecting to gmail address for the 10GB of emails, it behaves damn irregular: - periodic freezes of mouse and keyboard, for about 0.3 seconds every 3 to 5 seconds. - Thunderbird message says downloading email number out of total number of emails (very slowly advancing) but every 3 seconds it starts downloading email 1 of those emails - station has cumulated some 20 hours working, most of these left to finish syncronizing. Usually in 2 - 3 hours there is time enough.

This happens only when Thunderbird runs, when I close it the station runs fine. Same hardware on the station as before..

Did you encounter this? Thanks.

Mam problem z kontem e-mail. Dotyczy on konta obsługi klienta sklepu internetowego. Od kilku dni maile z Amazon, Allegro, Emag itp w ogóle nie dochodzą. Nie wiem co jest tego powodem, nic w ustawieniach nie było zmieniane, stało się to z dnia na dzień. Jak mogę to naprawić?

Hello,

All my outgoing messages are bouncing back to me, no matter who I send or reply to, just from one of my email addresses: heidi@benvenutotravel.com

So I cannot reply to anyone nor send, although it shows copies in my sent folder???

When trying to retried incoming messages, I keep getting popup that ask for my password. I tried to use the hidden password in the app, which till now has always worked, but get the following message:

"Sending of password for user (parrotdise13@att.net) did not succeed. Mail Server inbound.att.net responded [SYS/TEMP] server error - please try again later."

I have browser access to my att/yahoo parrotdise13@att.net account after changing my password. But entering the new password in the above mentioned popup produces same result.

Thanks, John B.

Overnight, I suddenly cannot send emails. I keep getting an error code AUP #OUT-1500 that says: "The email address you are sending as must match the email address you used to auth. " But I have changed nothing. Everything worked fine Thursday when I went to bed; got up Friday unable to send. I can receive all day. And I can send using my provider's website, but I'd rather use Thunderbird as usual. What the heck just happened? None of the Support suggestions work. Thanks for any wisdom you can impart!

Hi I am getting on a daily basis Thunderbird Not Responding, so I have to start Task Manager to close the program and the open it up again. I like this program but this issue is now on a daily basis and has been like this for a couple of weeks now. Kind regards Jim M

I have tried multiple times to add an email account to thunderbird in windows but I keep getting the error, "Unable to log in at server...". I know the details are correct as I'm copying and pasting them from my password manager so I'm not sure what the problem is.

I have 2 windows 10 computers both with Thunderbird. One computer never has trouble with getting emails. The other shows every day "Login to server mail.hoster905.com with username cnc@lcgnm.com failed" I have reset this one password at the server, entered the new password in Thunderbird and can the get mail. That day only. Next day same problem.

Since Thunderbird updated to 115.11.1 (64-bit), , the DEL key no longer deletes messages from within the message window. It DOES still delete the messages from within the message list. Any ideas as to why?

Hello We are trying to set up an email client Mozilla Thunderbird, but nothing works, because the email client does not have enough fields that are specified by the provider, here is a letter from them:

Hello,

Your SparkPost account is configured correctly. I recommend contacting Mozilla Thunderbird support to see where you can enter the required fields in their SMTP client to connect to SparkPost. You can see the full client configuration steps here: https://developers.sparkpost.com/api/smtp/

They should be able to prove the steps to get these settings configured in their SMTP client.

Please let me know if you have any questions; I will gladly help!

On 5th June I received the following message when I opened up my email.

Warning: Potential Security Risk Ahead. Thunderbird detected a potential security threat and did not continue to live.thunderbird.net If you visit this site attackers could try to steal information like your passwords, emails or credit card details.

I have not received any emails since then. Nor able to send any. I can receive and send my emails through my Mail provider- Telstra Bigpond and also receive and send on my Apple iPad and Phone. I have tried turning the computer on and off but this does not help although I am no longer receiving the warning message. Hope you can help fix this. Regards Dawn Howell

I keep getting the following mesage, this has started all of a sudden, computer did a windows 11 upodate yesterday.

Sending of the message failed. An error occurred while sending mail. The mail server responded: Sender Policy - Relay Denied 211.30.49.152 authenticated connections ONLY. OB303 e{391cd896-4e9f-4d6a-9932-850a9ace859b}. Please verify that your email address is correct in your account settings and try again.

For the last 2 or 3 days I have been receiving the above message when accessing emails. I have experienced this problem occasionally in the past and for a day at most, the problem usually associated with virginmedia. However this is now proving to be disruptive and I don't where the problem lies, with Thunderbird or Virgin. None of my settings etc. have been changed and I can access everything if I go directly to the virginmedia website but the handling of the emails is cumbersome. Any ideas?

Hi all,

Sorry for asking again, but after reading all the posts here the problem is still occurring.

When I launch Thunderbird, I'm asked for new data (Account Setup), like there is no profile available.

The application seems unable to locate or recognize my existing profile, but the profilefolder exists and its almost 90Gb of data. Should I complete Account Setup windows with my data?

Please help me! Tried with thunderbird -p command to repair or select another profile but with no success !

- installs.ini Default=Profiles/xxx.default Locked=1

- profiles.ini

Default=Profiles/xxx.default Locked=1 [Profile0] Name=default IsRelative=1 Path=Profiles/xxx.default Default=1 [General] StartWithLastProfile=1 Version=2

User Agent Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:115.0) Gecko/20100101 Thunderbird/115.11.1 OS Windows_NT 10.0 19045

Thank you !

I have tried nearly everything on all the forums and help sites to no avail. I still get the error message that my message cannot be sent. Most of the time I get the server response as [C20]: message blocked. I have triple-checked my SMTP server settings and password, uninstalled TB and re-installed. TB seems to have recently changed the profile in use, so it no longer has all the files in Mail\Local Folders it used to have. I'm thinking I need to create a new profile but I don't know how to do that.