Hi,
Right after running Spybot S&D this weekend, I have suddenly become unable to send email via Thunderbird. Sending email worked just fine up to this point.

I can receive email with no problems;
I can send via my email provider's web interface;
ping via port 25 works fine;
ping of smtp server works fine;
smtp address is accurate;
my ISP has neither blocked nor flagged me;
every other check the tech support at my ISP thought to do worked just fine.

Options at Thunderbird's help site either do not apply or do not change my status. Updating to the most recent version of Thunderbird did not help.

My Linksys network adapter (hardwired) settings have not been changed.

Norton Antivirus is set to check but not block emails.

Can anyone suggest why this might be happening? Does Spybot ever block sending of email?

Thank you for your time.