Peculiar problem with email and Thunderbird

[wireless]

I've been using Thunderbird as my default email program for a few years -used to use Eudora, but that's another story- and by and large it works well for the 3 email accounts we have. Today a frustrating issue manifested itself, I can get Thunderbird to download only 2 out of the 3 accounts. I have no problem accessing the account via Google webmail so at least I can see what's been sent, but there's a persistent authentication issue with 1 out of 3 accounts, which so happens to be my primary account. No changes were made, doesn't matter whether or not I have my VPN running, it just will not authenticate. Any suggestions what settings to delve into?

Thanks, Pieter.


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