Thunderbird Community Forum

Today I started getting this message and I can no longer access new mail:

"The RETR command did not succeed. Error retrieving a message. Mail server outlook.office365.com responded: Server Unavailable. 21"

Does anybody know how I can fix this?

128.11.0esr (64-bit) on a MacBook Pro

The 'Open With' option often, but not always, does not appear with email attachments. There seems to be no pattern with the type of files causing this. eg 'Open With' available for some jpeg files and not other jpeg files. Similar for other types of files. However I know if I copy files to desk top they will open - but then after opening on desk top, they WILL then open from within the email

I have two computers on which I use Thunderbird. I have never been able to successfully copy my email filters from one machine to the other, no matter what method I employ. It seems that this should be at least part and parcel of copying my profile to the new computer, but I find I have to rewrite the filters yet again. Please assist.

Hello Thunderbird,

I've read all the explanations on how to use threads in Thunderbird, but I can't find a way to reduce the shift to the right of each line of the thread (incrementation). Visually it would be sufficient if the thread shift were smaller (see attached screenshot). I looked in the configuration editor with [mailnews] but I couldn't find it. Does this exist? Thanks for your help.

Hi, I've encountered a problem where if any error occurs when you try to create a new calendar event (I.e. Thunderbird cannot connect to the CalDav server), it will give you an error pop-up and discard everything you have input.

Losing work like this is extremely annoying and I think what should happen when an error occurs is that Thunderbird would go back to the event creation popup, preserving everything that was input into it, and let you try to create the event again (perhaps save it into a different calendar).

I'm not sure if this is the best place to ask about this but it was the most easily accessible place I could find.

This happened in Thunderbird desktop version 138.

What does this mean: "The account bl-dn10@comcast.net is being processed. Please wait until processing is complete to get messages." Can't get email in this account. Out of the blue.

Get message: Login to server smtp.mail.att.net with username failed thunderbird or

Unable to authenticate to Outgoing server (SMTP) smtp.mail.att.net. Please check the password and verify the 'Authentication method' in 'Account Settings | Outgoing server (SMTP)'.

Can send from my Gmail account though.

I'm using Thunderbird version 128.11.0esr on my Windows 11 desktop computer.

I have many email accounts in Thunderbird and Thunderbird automatically forwards email from some of the accounts.

Occasionally I will see an error message: "Send Message Error. Sending of the message failed. An error occurred while sending mail. The mail server responded: Error sending message for delivery... Please check the message and try again."

Can I trace this error back to determine which email account is causing the error?

Thank you.

First when I try to write an email I put the op name in the To: box but the contact list from my address book I imorted from my new outlook(I do not have 365)does not work -there is nothing. I need the simplest way to synchronize the address book with the To: when I send an email. 2 I'm confused about export and import. I always thought I import from something and then I export to something but it seems that Thunderbird commingles the two terms. I was trying to import from my outlook new to Thunderbird. Is it a matter of language or understanding? Thunderbird seems to work except for the above mentioned feature. Please explain? 5-29-25

Thunderbird is time-stamping emails I send and receive in a different time zone. How do I change the time zone it is using? I'm using 128.10.0esr (64-bit) on a Macbook running Sequoia 15.4.1.

Thanks in advance for any assistance.

Hi I have recently switched to Thunderbird and Firefox for my Windows 10 Home 64 bit Laptop to give me conformity with these two apps on my other Laptop running windows 7 Home 64-bit. However, I seem to be unable to use any message links or hyperlinks as I get the error message attached. I have searched the internet for a solution but none seem to work. Can anyone help. Eric

I have been using Thunderbird for years and have never had any problems; unfortunately, from few days, every time I try to download my mail, thunderbird starts downloading all my 15,000 emails, even though they have already been downloaded and read. I am desperate... I don't know what to do. Please help me... thanks!

Hello. Thunderbird has suddenly (overnight!) stopped autofilling outgoing addresses on my emails in 99% of cases. What is going on and what can I do about it?

Thanks in advance for any help!

(I am running MacOS Sequoia on a MacBook Air)

I have used Thunderbird and its diary for years, and make extensive use of reminders in the diary (my memory is not what it once was!). Latterly, when deleting or postponing a reminder, Thunderbird goes into "not responding" mode for many seconds or even some minutes.

I have Thunderbird linked to both my gmail and my protonmail email accounts. If I look at Task Manager when Thunderbird goes unresponsive it seems to be the connection with protonmail that is the problem - see the attached screenshot.

Help, please

Andrew

For some reason some important emails are now regularly going straight to deleted before I've even seen them. Luckily I know to keep an eye on them but how do I go about rectifying this please.

New incoming emails are no longer marked as "unread" and In bold print when they arrive. I have to manually mark them as unread. Then when I read them, they do not consistently change to "read". This was not a problem until I started using the 128.10.0esr (64-bit) version of Thunderbird.

OS is Kubuntu 24. TB version is 139. Password was working on the ESR version, but once I upgraded to 139, my password no longer works. I tried going back to the ESR version, but now the password doesn't work on ESR as well. Help ! Email is phlag311@att.net

I created a POP3 Gmail account but It doesn't appear to be syncing with the address book. Or at least I see no evidence of it. Is syncing Gmail contacts only available when Gmail is set to imap?

James