Signature in emails & AutoResponders

Hi all, Im new to this board. Just found out about it. My Q is how do I insert an signature in my email. Not the regual text signature but the real one. I know how to put it on a webpage. You just sign it on a white paper, scan it, save it as .gif file, uplaod it. But what if i wanna put it in my yahoo emails or autoresponder like I use freeautobot.com.????
Thanks


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