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Thunderbird front end repeated mailbox server login failure

Making moves

What would be the most likely cause for the Thunderbird front end to repeatedly fail to log into one or any of my 5 mailbox servers?

This issue can happen to any one of them, *hotmail*, *yahoo*, or my personal independent mailbox server * bluetiehome*.

It happens more often than not, I will repeatedly see the notice flash up on the lower right corner of the screen.

Because Thunderbird hasn't logged into *a* server I can't write, send or receive emails. All I *can* see is what  is listed in each of the mailbox inboxes, sent, saved from a previous session that DID log in.

There is nothing wrong I can see with any of the mailbox server settings *imap*, they are all basically set to * default* for that mailbox server. The smtp servers are all set to *default* as well.

This has me puzzled & it's a bit of an annoyance not being able to send because Thunderbird hasn't logged into the mailbox I am using.