I am not a great expert on this, but I have the same problem time-to-time with Thunderbird. Here's what I do (altho you might already have tried these with no luck):

First, I reboot the computer -- Windows XP -- twice. Often this solves the problem. If not,
I already tried that.

(2) I unplug the cable modem and the router. Plug the modem back in, wait a spell, then plug in the router. If this doesn't work,
That worked for sending mail but, I still have to go to my ISP's website to get my mail.

(3) I exit the firewall.  If still not working,
I will check on that.

(4) I press the reset button on the router which brings it back to factory 
default.
I will try this.

(5) At this point, if it is still not working (happened to me only once), I go into diagnostic mode. I try restoring XP to an earlier date; I hook directly to the cable modem without a router; I check the incoming & outgoing email server settings (and switch them to different ones); I delete the server settings and reconfigure them; I call my email provider for help; and as a last resort I uninstall Thunderbird and reinstall.

I'm sorry that I can't advise more besides these novice instructions. I am replying only since there has not been a more knowledgeable response to you posting and wish to help.

I don't have any 'Restore Points'.

I know the server settings are fine because, I checked those, after I un-installed Zone Alarm.

Christopher


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