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I can't send anything. I updated at 3 ish and now it says the following : "Sending of the message failed. The message could not be sent because connecting to Outgoing server (SMTP) promail.ptd.net failed. The server may be unavailable or is refusing SMTP connections. Please verify that your Outgoing server (SMTP) settings are correct and try again."

In V.10, it used to be I had to really swipe all the way left for delete to occur.

Now in V.13 only a small/partial movement deletes.

This is tool easy to mis-trigger. Please go back.

Thanks

I'm looking for the Thunderbird for Android user manual. Is there something like that available to read? All I found was scattered FAQs.

No, I don't have a specific question. I just want to read the whole manual.

How can I filter the list of emails in a folder? There's this 'Ctrl-K' search box but does nothing like I want. I just want to filter the displayed list of emails by correspondent. The Ctrl-K system is a baffling mystery, AFAICT you always get a search for 'mentioning' of the search string, whereas a filter for correspondent would be useful too.

I've come over from Postbox as that app is no longer being supported. In Postbox there was one file (panacea.dat) that controlled how many old locations you would see in the Move To menu. Once the number of items got to be a bit too muchj, I would delete that file and it would clear the Move To menu item. Is there such a file in Thunderbird that controls the Move To menu, or can it somehow be controlled by a setting in Thunderbird? Thank you.

How can I remove the moving blue ball from the tab of a frequently used website? It's distracting and hopefully not symptomatic of a problem It appeared on this new computer/monitor, used to be an icon Thanks, --Laurie

I don't understand the problem. My accessing Firefox has become limited. I received a note to Upgrad to windows 11... I hae already upgraded. What must I do too have it recognised?

I have lost my tabs after the recent update. They used to show all tab groups in toolbar icon as mentioned here (https://support.mozilla.org/en-US/kb/tab-groups) in manage tabs section. Only the groups that were open are retained, the groups which were closed are lost. They contained important tabs which I haven't bookmarked. I didn't see any policy of removal of inactive tab groups after certain time, any help would be really appreciated. I use the desktop app on Linux.

Hi

Firefox has stopped syncing from my android phone. In the 'connected services' section of the account page it shows both my PC and phone connected. On the desktop it shows synchronised frequently updating (e.g. 24 seconds ago) but on phone it shows 'never'. It previously showed last sync as 14 days ago but I relogged (from both devices) to try to fix it. It just so happens that 14 days ago I added a new email address to login with my mozilla account (previous email became secondary), but I have checked and both devices are logged in with updated credentials.

Any ideas other than re-install?

This has worked for me for years. It just began a few days ago when I tried to login and look at my new auto insurance policy. I've cleared the cache/cookies to no avail. I can access the web site with Edge (yuk)

I upgraded to 143.2 on iOS 26.0.1, but I cannot access any swipe tab gestures, which I assume means I can just swipe left and right in address bar to move between tabs.

Hi, I have recently had a problem with one of our cats walking on my keyboard. Previously the Thunderbird page had two panels, the top one listing emails in date order and the bottom one displaying the message I had highlighted on the top panel. Now I have the top panel which is fine but I can't get the bottom panel. Can you help please? Douglas.

This is a brand new problem, for me. It just started today when using FireFox. On nearly all websites, including Mozilla support, when I click on an embedded link on a site, firefox asks me to select an app to open the https. Even if I tell it to let firefox open all https, it still asks me everytime. to make it better, it still doesn't always let me open the link and I go through the same thing when I click the link again.

This also happens when clicking on the search box in *any* search engine, e.g. Google, Startpage

See the image below.

I've attempted to change all cookie & tracking settings, no help. I even uninstalled and reinstalled Firefox.

This is making FireFox useless.

I had to use my default browser, Brave, just to submit this question. I only use FireFox for social media accounts, sites I need to link to my sm accounts and the occasional web search. For example, linking my Etsy shop to facebook. When I clicked the link "link to facebook" is when I noticed this problem.

I can receive, but not send, emails using Thunderbird on my PC. I believe this problem began when Thunderbird was updated on 1/13/26. I have no problems sending email on my tablet.

My service provide does not support TLS 1.2, so I tried changing security.tls.version.min to 1. This did not help.

The attached shows the error message and my SMTP settings (1st image) and my service provider's email server settings. I tried changing the SMTP port to 587, but this resulted in a time out error.

Any help is appreciated, Norm

I can no longer send emails. I can send them through mail web browser and was in touch with their technical support and the problem is not on their end. The message I get when trying to send an email is: "Sending of message failed. The message could not be sent because connecting to outgoing server(SMTP) Promail.ptd.net failed. The server may be unavailable or is refusing STMP connections. Please verify that your outgoing server (STMP) settings are correct and try again". I checked my outgoing server settings and they are correct. I started Thunderbird in Troubleshoot mode and the problem still occurs. I started my Windows 10 in Safe Mode and the problem still occurs.