I looked and did not find the old one so I reposted..

I had updated info to try and narrow down the problem

The new Thunderbird and Firefox did not help.

IE can send files with attachments and I will try (Argh) Outlook to see if it will send email with attachments.

Why would IE work and not Firefox ?

I has to be something with Mime I would think.

Does IE have Mime built in it and my Mime is corrupt in XP?
Can I reinstall Mime? How?

I checked with my laptop and Firefox works fine with Yahoo...

This is just Odd..