You can add a signature in Yahoo Mail to the bottom of every email you send and customize it using fonts, images, and more.
You can change your Yahoo Mail signature the same way you add one, through the email client's mobile app or website.
Such digital signatures - automatically added and invisible to the e-mail sender - are the foundation of a joint effort by tech titans Yahoo and Cisco Systems to curb the torrent of forged e-mails ...
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