http://www.trafficisgold.com/ A Step by Step video guide on How to add an email Signature in Thunderbird. Thunderbird is a Mozilla email client and a free alternative to Microsoft Outlook 2007 and 2003.
Step One: Create an HTML signature file:
Step Two: Add signature file in Thunderbird
Tools Account Setting
Pick the identity you want to add a Signature to
Check box that reads: Attach This signature. Check the box, then choose the file we created prior.
Click OK
Try composing an email and see if your new signature appears
