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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