You might notice that the links in your email signature point to htmlsig.com and then redirect the users to your specified link. This is done so we can keep a count of the links in your email signature to show to you when you on your dashboard.
If for some reason you would like to disable the link count tracking, you can do so for any signature under the extra tab in the editor. The first option there allows you to disable link tracking.
If make changes to the link tracking settings of a signature you will have to re-install that signature for the changes to take effect.