Форум поддержки Thunderbird

I have been using 4 email accounts with TB for years now with no problems - 2 use IMAP gmail accounts and two POP mail accounts. In the last week, when I open TB (on a mac OS10.15.7) I am asked to enter the password for these two accounts. I have not changed the passwords for these two accounts anywhere else so I don't know why TB suddenly wants me to enter them. No matter what password I enter here, I am told the login failed and am asked to enter a new password. I enter a new password and go back to being asked for passwords again.

What password is TB looking for? Where is it stored so that I can look for it? When I go to Settings/Privacy and security/Saved passwords only passwords for the two gmail accounts are shown. Where can I find the passwords for the POP Mail Server and how do I reset them?

I keep getting the message "Sending of password for user kcmsansiro did not succeed. Mail server pop3.iinet.net.au responded: [SYS/TEMP] Account is temporarily unavailable." and "Sending of password for user kcmsansiro did not succeed. Mail server pop3.iinet.net.au responded: Disconnected for inactivity." and "Login to server pop3.iinet.net.au with username kcmsansiro failed" on all 3 accounts (kcmsansiro, phildemaria and philrossi)

I can still receive messages on phildemaria but cant send without getting these messages

Recently been migrated to the message co

Thanks for any advice you can offer

My mails are automatically corrupted or deleted from system.

Before my mail corrupted i had try to make folders for inbox mails and during this process my some of mails are automatically deleted lr corrupted.

How can i resolve this issue Please guide me

I have the most recent updated Thunderbird, I wish to delete a email account, however under settings Account Actions is absent. I have tried searching for and answer but no way to remove it so far. I have used Thunderbird for near 10 years and usually there is the Account Actions menu item. I see all settings its should be right under the item Return Receipts. But nothing is there.

Thank You for the help.