WiseStamp is a handy dandy app that allows you to customize your email signature.
I use the free version in conjunction with Gmail and it works swimmingly well for both branding and presenting a professional signature from a web-based email account. WiseStamp is compatible with other web-based email systems like Yahoo! Mail, Hotmail, AOL and a few more (there's a Thunderbird add-on).
Recruiter Uses: Branding, using icons to strategically promote all of your social media networks; making it easy for candidates to get connected via other social media platforms from one strategic location; great way to set your signature apart from the standard. You can even share your up-to-the minute recruiting content (blog posts, pictures and video) via the RSS feed options.
Caveat: Only works with web-based email clients for now
Tech Tools Review Rating: Go for it! Easy to install, and easy to create a signature. There are even a few customizable styling options on the free account. Check it out at WiseStamp.com.
For More on Inbox Management, see: How To Make Your Inbox Work