Thunderbird Community Forum

Hi I am at my wits end here - The date in my Thunderbird is behind by 1 hour. This is affecting sent messages and also received messages.

This just started today. For over a year, the time has been correct. I have not changed any settings in Thunderbird prior to this issue.

My Win11 computer shows the date and time correctly.

I had a Win11 update yesterday. Not sure if that has affected Thunderbird (My province - Manitoba Canada - also stopped using daylight time changes in the last couple of months.) We are now permanently CDT, and is UTC/GMT -5 - which is what it shows in my Win11 setting.

My timezone and time in Win11 settings shows correctly.

Just to see if it would make a difference - In Win11 settings->Time & Language - I changed the time zone automatic to off (even tho the time zone showed correctly) and set it manually to UTC-5:00 Manitoba, - I changed 'Set Time automatically' to off, set the time manually and synced the time.

No difference with Thunderbird.

Why is my time off in Thunderbird?, and what can I do or check to fix this?

Was unable to edit appointments attempts placed a previously unknown dialog box. Search for info found one person advised Select Calendar (tab), edit, calendar properties and uncheck the read only box.

In my case the box was already unchecked, checked it, tried it, same result. Unchecked it, tried it same result (not able to edit).

Next I thought maybe some data location is not being changed. So I closed all files, shut down (not a restart) my machine, and restarted it. Opened Thunderbird and tried to change an appointment, did not work. Went to Calendar (tab), edit, calendar properties and found the read only box checked. Unchecked and all seems back to normal operations now.

Since the Thunderbird update of 30 Sept the ability to attached files to my emails has 'vanished'. I press the attach 'button' but there is no response. Never had this as a problem before. I am running Windows 11 home version. Help!

I keep getting the following (see attached image) when I try to open my Thunderbird. I tried to unsuccessfully open safe mode because it still asks for a password from my very old BlueHost account. I previously worked with AI on this and deleted all BlueHost lines I could find in my account. View the image I have included and see all the messages that include BlueHost. They must be hiding somewhere in Thunderbird. I am not sure what version I have because I cannot open it. Please help! I be happy to send you my phone number is needed.

When editing a contact in Address Book, after selecting a time zone from the drop down menu and saving the contact, only the first 7 characters of the time zone string are displayed in the contact view. When reopening the contact for editing, the time zone field is shown as empty again.

Using Thunderbird 115.18.0esr Supernova 64-bit on Mac laptop OS 10.13.6. Worked fine for years, with ongoing Thunderbird updates, even though Mac OS is 32-bit. Suddenly, after 10/6/26 can't retrieve emails although I can see them on the ATT Yahoo server website. Can still send emails with Thunderbird. Inbound server settings are: POP server inbound.att.net, Port 995, SSL/TLS, Normal Password (I long ago created a Secure Mail Key, and even tried creating a new one). But inbound server name doesn't show in Saved Passwords (only outbound server with Secure Mail Key as password)? I have tried everything suggested, repaired my inbox folder, updated Thunderbird files, etc. in Profile as recommended. But still no prompt for password when attempting to get messages. Just shows "Done" at bottom left with no new messages received. But new messages are seen on server website. So it appears that Thunderbird isn't able to connect to the ATT Yahoo server to get emails. Why? And what else can I do? I love Thunderbird and want to continue using it.

I have been getting the following error message each time I log into my email today: " The STAT command did not succeed. Error getting message number and sizes. Mail server pop.bluedomino.com responded: [SYS/TEMP] Internal error occurred. Refer to server log for more information. [2026-10-14 12:31:46]" I get a message for each of my email accounts. My spouse also gets the message on hers. The server we use has just been transfered from Blue Domino to Network Solutions.

A week ago my sent emails were being rejected and the error message included something about bluehost (I called them and it was fixed within the day). Now it's happening again and my error message says:

host eig-east.smtp.a.cloudfilter.net [3.228.35.199]

   SMTP error from remote mail server after end of data:
   550 Connection Rejected - see http://www.spamhaus.org/query/ip/162.241.218.139 AUP#BL

I receive emails yo simon@padworks.plus.com, but cannot send them, with a message saying ...

Sending of the 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.

please also reply to simondowthwaite246@gmail.com

Thunderbird flatpak -1.0 I recently lost the ability to attach files of any kind to messages. when I click the button to attach, no option to choose messages from files are available. I cannot go to the file and share with Thunderbird. I cannot copy a file and attach it. I have tried restarting Thunderbird, and my system (Po_OS Linux) with no result. thanks for the assistance!

At Thunderbird > Settings > Privacy & Security > under Passwords > "View Saved Password", the dialog box pops up correctly. But the size of the box is so small the columns can't display the complete info i.e. username, password, or date. When I hover on the column divider I get the left/right sizing arrow but nothing happens when I click & drag the arrow. I am on Thunderbird 159. Thanks.

I have just starting using Thundermail and one thing I am trying to understand better is Address Books in Desktop Thundermail in Windows 11. I now have the following under address books: All address books (assume that this is just everything in all the address books), Personal Adress Book (empty), Contacts ( not sure where it comes from, probably 1 or both of the 2 emails of mine I have connected), Contacts (not sure where this came from but looks suspiciously like it comes from my gmail email or emails? as it is a long list), Thundermail Address Book (empty), Collected Addresses (looks like it picks these up from emails I send or receive). I am interested in understanding what forms this initial list of address books, do they continue to reflect changes in the original source address books from outside or are they a once only transfer?), how I can manipulate them, probably to end up with: All address books, and other address books continuing various subsets for convenient access to a smaller list of contacts under these sub address book names. Can I easily copy or move addresses between address books? Documentation already answering many of these questions may already exist? Thanks for any help or advice you may be able to provide.

Trying to attach a file to an email, the "attach" button opens but doesn't react choosing "file", where the function worked seamlessly before. What can I do? - Many thanks for hints!!

After starting Thunderbird I set up a list of subheadings in the local column left of the inbox. I filed all my important emails into appropriate sub-headings (events, invoices to do etc etc). Suddenly all of them (including the scam subheading ) have disappeared and all there is Local and delete. Please can you advise me where they have all gone and whether I can retrieve them because losing them all would be a bit of a disaster Thank you

I am early days learning to use Desktop Thundermail Calendars in Windows 11. I have several calendars showing up in my list of Calendars. Home, My name (seems to draw input from 2 emails I have connected), New Holiday, Thundermail Calendar, My wife's name (seems to draw input from 2 emails I have connected that she wants me to monitor as she rarely uses them). I would like to get a basic explanation of what each of these calendars are and how they may relate to each other. This may already exist somewhere? For example: what is the difference between Home and Thundermail Calendars? Why do my 2 other emails only form one combined calendar?

I have used Thunderbird for years and have updated new versions. This past week, I can no longer compose new emails; no prompt given for that function. What can I do? I am not a computer geek, so I don't really know how to fix this problem, which seems to be a software issue. Thank you.