Scan the signature, insert it as a graphic at the foot of the merge letter.
If you need an assortment of signatures, see
http://www.gmayor.com/mail_merge_graphics.htm

Signature
<>>< ><<> ><<> <>>< ><<> <>>< <>><<>
Graham Mayor - Word MVP
My web site www.gmayor.com
Word MVP web site http://word.mvps.org
<>>< ><<> ><<> <>>< ><<> <>>< <>><<>
> Our company recently moved and I was given the task of sending out a
> mass mailing. I need to insert a signature at the end of the letter.
> Any assistance would be greatly appreciated.