Making sure that all of your outgoing mail contains a standard signature with a link to your website is a great way to passively promote your website to everyone you send an email too. But, if you’re using a web-base email program like Yahoo!, Gmail, or Hotmail, you may or may not have that option. However there is a free tool that can help. One of my Twitter followers, @DocJerry clued me in on a free Firefox add-on called Wise Stamp that allows you to append a custom signature to your outgoing Gmail, Yahoo!, or Hotmail emails. Plus, it also has built in support for your social networking accounts too! Check it out by watching the video below: