Thunderbird Support Forum

I ran into an error on my Windows 11 PC. If I add an attachment via the system menu called up by the right mouse button, the size of the attachment is displayed in terabits and cannot be sent :-)

Hello, The Optimum SMTP is recently rejecting emails I am sending from one of three Optimum email accounts that I have. When using the one account I get the following rejection notice:

Sending of the message failed. An error occurred while sending mail. The mail server responded: Spam detected by content scanner. Message rejected (ID 6661A65F0037E564). Please check the message and try again.

This only occurs when I use Thunderbird to send messages. If I use Outlook on the same computer, I do not get the error. Previously, I was getting the error on all three accounts, but when I upgraded to 64-bit Thunderbird, the problem went away. Of course, I called Optimum and they said that the problem was on my side and were not helpful. They also don't take any responsibility if you don't use their web interface.

I would appreciate any ideas that anyone has on what I could try to eliminate this problem. Thank you.

For the Inbox (main) window:

• Choosing File::Close does nothing.
• Typing Cmd-W flashes the title of the File menu but otherwise does nothing.
• The only way to close the window is to click its red close button (upper left).

Thunderbird 116.0, 115.10, 115.08 and earlier Mac OS 114.5 and earlier

We have had thunder foe a few weeks now and have been very happy with it. Today it suddenly stopped sending and receiving emails. I have checked the help page but am struggling to figure out how to fix. Can you please help. Cheers Colin

All messages that I delete,send ,archive and drafts, simply disappear without a trace.For years this worked well !Tried downloading and reinstalling Thuderbird without success.

I just started using TB about 2 weeks ago. I have not even gotten to the point of installing a eml to mbox software to move my folders, etc into TB from emClient. I am changing because emC quit authenticating 'out of the blue'. I have been getting and sending emails perfectly well in TB until about 4 days ago. I get a message that says it cannot connect to Comcast server. Nothing about authentication or a password. It just stopped! I talked to Comcast tech support today and they said everything on their end looked good. I have spent several hours tonight going thru TB checking everything, reading this forums notes on unable to connect, restarted a couple of times, etc. Needless to say, I am not happy and really don't know if I should ditch TB and go to a 3rd different email program. (Note: I am not one who changes often or without a fight to keep a program.) I have been with emClient for over 10 yrs. All their suggestions have not worked. I like TB and really want it to work. Suggestions please.

Dear Support,

suddenly my INBOX file has a size of 480GB - the mails in all my IMAP folders online is less than 4GB.

How can that happen?

Is there a fix or should I just re-create the account?

Best wishes, Johannes

Today, Thunderbird has switched servers on my two email accounts. My two accounts are a Cox email which has been moved over to Yahoo and a business account which uses Gmail. I have messages on the Yahoo server but when I ask Thunderbird to "Get Messages", I can see from the info at the bottom of the screen that it's checking Gmail not Yahoo.

Okay, all of a sudden it's now back on track. I don't understand how this glitch came about. Hopefully, it won't happen again.

Bill Dinger

I want to move a lot of gmails to the Bin but keep them in local folders. An answer to someone else's problem said to be sure the local folder contains a true copy and not just a link, by checking that I could read it, but how do I do that for several thousand emails? Maybe they are all true copies in at least in one local folder? I need to remove a large chunk of 25000 gmails in All Mail to free up space on my hard disk. I was having problems with Global Search and followed instructions to re-index everything. Apart from taking several hours to index All Mail, I subsequently found that I could no longer get 2GB free space by using Disk Cleanup, the best I could get was about 300MB, which is apparently too small for Thunderbird to compact All Mail, or for Dropbox to sync with my mobile phone camera photos. The All Mail file in C:\Users\Michael\AppData\Roaming\Thunderbird\Profiles\hgwapwu4.default\ImapMail\imap.gmail.com\[Gmail].sbd is 4.5GB, and Important is 1GB

On startup TB pops an error box up saying ' There is no email program associated to perform this action'. When dismissed TB continues to open normally. No other errors seen during operation.

I have checked my Win 10 Control Panel Apps options. TB is the email default. MailTo, file type .eml and all other settings I can see are set to TB as well.

Hi I have asked a question about my new email account in outlook. I have set up a new identity with the new email address. I have set up an app in outlook. I can receive emails but cannot send them. Answer have apparently been posted but I can’t see the email thread either. I really need some help here please. Can the answer be emailed to me or at least a link to where the answer is posted on the thread. Thanks

Hello! Since I couldn't find help in the forums, I will create a new question. For about a year now the PC at my work will not open mailto-links correctly. There is no account to select from, the subject has a lock-symbol. The receiver's address is correct though (I replaced it with "address" for the screenshot). This PC is the only one I know with that problem and only with external mailto-links. If I click on an email address inside a mail, it opens it correctly. Thunderbird version 115.11.1 (32-Bit), Win 10

It's pretty impractical, so I am hoping for help. Thank you!

When going from Help on menu to check for updates receive the error message - Failed to check for updates.

Running on Windows 10 with NAV - problem is recent in origin but I can't be exact as it's not my regular PC.

So far I've manually updated Thunderbird from 115.11.1 to 115.11.2 (64bit)by downloading from Mozilla website, rebooted from cold several times, and applied the fix from Norton:" https://community.norton.com/en/forums/auto-update-norton-360-v2449067835-now-causes-security-exception-thunderbird " in case it was related. It appears to be unrelated because on my regular PC the NAV update occurred necessitating the fix to the security exception error but don't have the checking for updates error.

thanks

Suddenly without warning Thunderbird displays a message 'Checking mail server capabilities.......' in the bottom left of the inbox screen. Messages from the server [Optus] are not downloaded. I have changed the SMTP server to the default 465 and changed the security setting to 'None' but the problem has not been resolved. I note that there are alot of queries about this problem but I cann ot find a solution anywhere on the Mozilla help pages.