Thunderbird hangs due to POP3 server error right at the start. "An error occurred with the pop3 mail server. Unable to write to the mailbox""

Was on version 115, had this problem. Updated to version 155, same problem. One of the email accounts I set up on Thunderbird is redacted1@lake48.net, registered with 123… (자세히 살펴보기)

Was on version 115, had this problem. Updated to version 155, same problem. One of the email accounts I set up on Thunderbird is redacted1@lake48.net, registered with 123-Reg. However, this is a forwarding address and has no email server, which is why I am getting the error now.

Messages addressed to redacted1@lake48.net are forwarded to redacted2@lake48.net, which does have a server, My system was to download from there and use a rule to divert the incoming message to my redacted1@lake48.net Inbox. This has worked OK until now. Thunderbird gives me this error right at the start and then does not respond, so I cannot get in to investigate account settings, and cannot access emails in other accounts such as gmail. 123-Reg has today changed its system, assuring me I don't need to change anything. Clearly I do, but I can't get in to change it.

What should I do to resolve this? I have no other access to my emails.

Open 9

My Thunderbird Account was updated by TB on 2 September and since then all of my new emails go to Trash and although I've tried the various responses to such questions I've been unable to change the problem and I'd very much like your assistance please.

My Thunderbird Account was updated by TB on 2 September. Since then all of my new emails go to Trash. Although I've tried the various responses to such questions, I've be… (자세히 살펴보기)

My Thunderbird Account was updated by TB on 2 September. Since then all of my new emails go to Trash. Although I've tried the various responses to such questions, I've been unable to change the problem and get my new emails to come into my Inbox. I'd very much like your assistance please. Thank you.

Open 1

Thunderbird not connecting to server. Cannot send or receive emails.

Thunderbird not connecting to server. It says timds out and an error occurred connecting to mobile.charter.net. I can neither send or receive emails. This started 8/20… (자세히 살펴보기)

Thunderbird not connecting to server. It says timds out and an error occurred connecting to mobile.charter.net. I can neither send or receive emails. This started 8/20/2026

Open 25 3

Can I move my entire Mozilla Thunderbird from my old DELL PC to my new DELL PC?

Old PC is Dell WIN 10. New PC is Dell Win 11. Is there a way to move the entire program from the old PC to my new WIN without having to re-install Please advise. I don… (자세히 살펴보기)

Old PC is Dell WIN 10. New PC is Dell Win 11.

Is there a way to move the entire program from the old PC to my new WIN without having to re-install

Please advise. I don't want to start from scratch.

Open 1

Why are "all" of my filters still not working correctly

Enclosed are jpg copies of the current sets of filters failures in my TB email program. TB Error0 shows the 6 emails that have arrived and are placed in the INBOX. Howev… (자세히 살펴보기)

Enclosed are jpg copies of the current sets of filters failures in my TB email program.

TB Error0 shows the 6 emails that have arrived and are placed in the INBOX. However, each of these has a corresponding filter set up to move them upon arrival to a separate subject email mailbox.

Note: If I highlight the INBOX and then go to Tools > Run Filters On Folder ... all of these INBOX email messages will be correctly filtered and moved to their respective email mailbox, BUT each of them is shown as having been "read" and unless you pay close attention, you may not know where these INBOX emails were sent.

I am also enclosing TB Error1 & 2 that show the last couple of days message filtering errors.

I can find nothing wrong with how each of these filters are set up, yet they seem to consistently fail to operate when new emails arrive.

Note one of them is for incoming emails from ... schiffsovereign.com. I have edited this filter repeatedly, even deleted it and re-input the information. Yet the filter never takes hold and does what it is designed to do. I am enclosing a jpg of that specific filter as TB Error3

I am looking for suggestions on how to fix this problem.

Thank you and best wishes,

/s/ James T Saint, CCIM COO

Open 7 10

Problem signing in with Thunderbird and Oauth2

Hello Due to a massive cluster**k this morning, I changed my password by accident I think I've now got everything working again, except that Thunderbird cannot sign in t… (자세히 살펴보기)

Hello Due to a massive cluster**k this morning, I changed my password by accident I think I've now got everything working again, except that Thunderbird cannot sign in to my Google Account What I don't understand is that I have a password with normal and special characters and numbers, but the Oauth2 password is very different of course How do I know what to change my Oauth2 password too? Or perhaps the question should be how do I now generate a new one that goes with my new "normal" password Thanks in advance for any help

Open 1

My inbox "SUBJECT" and "FROM" are not correlating. Thunderbird is attaching the incorrect email to the subject.

HELP! My inbox "SUBJECT" and "FROM" are not matching. Thunderbird keeps jumbling my emails in my inbox so that the sender's email does NOT correlate to the correct email … (자세히 살펴보기)

HELP! My inbox "SUBJECT" and "FROM" are not matching. Thunderbird keeps jumbling my emails in my inbox so that the sender's email does NOT correlate to the correct email they sent... The order of the different columns in the inbox do not lineup - Thunderbird changes the sender name, or the subject. Hope that makes sense. For example I click on an email from my boss regarding a shift and an email from Voile skis comes up about some new products. The subject is the same one that is in the email but the "FROM" is my boss' email! Please help, I have quit re-opened, opened in "troubleshoot" mode, made sure I am in the newest update, etc. Thanks

Open 1

How to remove "Authentication Required"cloud80.hostgator

after the last Thunderbird update a username/password request pops up: "Authentication Required" cloud80.hostgator There is no Hostgator account so the only option is "c… (자세히 살펴보기)

after the last Thunderbird update a username/password request pops up: "Authentication Required" cloud80.hostgator There is no Hostgator account so the only option is "cancel" only then will Thunderbird download emails. how to remove this https//cloud80.hostgator request?

Open 5

I need to set up an email for husband (age 88) that I can use to communicate with Social Security & other agencies?

My husband (DG) is 88 and beginning to have severe memory & analysis problems. I recently tried for three days, using his computer, to set up an account for him on t… (자세히 살펴보기)

My husband (DG) is 88 and beginning to have severe memory & analysis problems. I recently tried for three days, using his computer, to set up an account for him on the Social Security site, that I could oversee. It accepted a password, but kept asking for a 'backup code' that supposedly was 'assigned' - so I would have a second method to verify the account. There was no way, on that web page, that I could request a 'backup code' or ask for the '10 backup codes' that were supposedly given automatically. I wanted to simply get a letter that explained his SSA eligibility, so we could apply for Senior housing. I was able to call SSA and request the letter - but it will take 14 days by mail. We need it now - and I should have been able to simply download a PDF eligibility letter to print out. In less than 5 minutes, I was able to request and download an eligibility letter for myself on MY SSA account - but could not do it through his SSA account. I need to be able to communicate with SSA (& other agencies) and receive their replies through an email "AccountForDG@centuryxxxxx.net" that I can read in my email account "CuriousQuestor@centuryxxxxx.net). How do I set this up? Thanks in advance.

Open 3

thunderbird not opening

I was having problems with my chromebook. when I start my chromebook and i click on the thunderbird icon it doesn't open ! I have restored my chrombook and reinstalled th… (자세히 살펴보기)

I was having problems with my chromebook. when I start my chromebook and i click on the thunderbird icon it doesn't open ! I have restored my chrombook and reinstalled thunderbird again but the problem is still there. The only way to access thunderbird is to open linux and type in thunderbird and then i have access to thunderbird once I turn off my chromebook and then reopen it once again thunderbird is not working !

Open 1

153.0.1 Error: current command did not succeed. The email server responded: APPEND invalid flag list", because IMAP server is rejecting the APPEND command because Thunderbird is sending two junk-related flags simultaneously: $notjunk and NonJunk

I have used Thunderbird with the same email account for years, creating subfolders and moving emails to the subfolders with no issues. With Thunderbird 153.0.1, after cre… (자세히 살펴보기)

I have used Thunderbird with the same email account for years, creating subfolders and moving emails to the subfolders with no issues.

With Thunderbird 153.0.1, after creating a new subfolder in the account, when attempting to move emails to the new folder, I receive the following error:

"Thunderbird: The current command did not succeed. The email server responded: APPEND invalid flag list"

Open 2

how do I stop the adding of all email addresses received in a message to my address book?

When I receive an email, all the addresses in the incoming email are added to my address book. As a result I get email addresses added of people I don't even know. I wa… (자세히 살펴보기)

When I receive an email, all the addresses in the incoming email are added to my address book. As a result I get email addresses added of people I don't even know. I want to stop that.

Open 1

Thunderbird won't accept correct password

Thunderbird demands my password for outgoing SMT server when I go to send an email but when I enter it, system won't accept it even though it is the correct password. I h… (자세히 살펴보기)

Thunderbird demands my password for outgoing SMT server when I go to send an email but when I enter it, system won't accept it even though it is the correct password. I have had this problem for some time and it comes and goes. Sometimes I have ebeen able to send without a problem, then it comes back I had a helpful reply from this forum (can't find who posted it - Mick?) tellling me to go into the error console (Ctrl + Shift + J) and delete eveything in that. I tried that. It worked at first, but now when I do it, it has no effect. And the problem now appears to have become permanent, although occasionally after I have been working for some hours, then suddenly I can send without any problem. Problem hasn't budged though for a couple of days now. This is a mysterious and erratic gremlin, which now seems to have taken root. Any suggestions please? Carol

Open 6

connection to server timed out

Hello, My internet provider is RCN. For the past couple of months, I’ve occasionally been getting the message, “Connection to server imap.rcn.com timed out.” As a result,… (자세히 살펴보기)

Hello,

My internet provider is RCN. For the past couple of months, I’ve occasionally been getting the message, “Connection to server imap.rcn.com timed out.” As a result, I’m unable to receive emails via Thunderbird.

All my settings are correct. Usually, the problem resolves itself within 24 hours, but sometimes, like this time, it lasts longer.

Any suggestions? Best, Magda

Open 7 2

Message filters has gone crazy for last 2 days

The last message in my inbox was on 9/3/2027. After an update, now all messages are now going into a different folder, which has only one rule, and that is all messages … (자세히 살펴보기)

The last message in my inbox was on 9/3/2027. After an update, now all messages are now going into a different folder, which has only one rule, and that is all messages from a specific email address. Just now, all messages from my inbox just emptied into a different folder. I don't know what happened with Message Filtering in the latest update, but I have to turn off filtering.

Open 1

New PC Upgrade (Win11) Installation

I have many years and email accounts on my old WIN10 workstation running all POP installations. I have a new workstation with WIN11. Is it possible to install TB on my ne… (자세히 살펴보기)

I have many years and email accounts on my old WIN10 workstation running all POP installations.

I have a new workstation with WIN11. Is it possible to install TB on my new workstation with my accounts installed as IMAP and keep the same folder configuration? I have many email folders and filters setup on the old workstation installation.

I would appreciate any installation recommendations. I've been using TB for years and would like to keep as much of the current configuration as possible.

Open 5