When you are sending an employment or business related email message it's important to sign your message in a professional manner, just as you would any other correspondence. It's also important to include your contact information so the person you are writing to can easily get back in touch.
Your signature should include, at the least, your name, phone number and email address. Depending on why you are writing you may also want to include your address and LinkedIn profile URL.
Here's more information on how to sign an email, how to create an email signature in your email program, along with more advice on sending email messages and how to send your resume and cover letter when you're job searching.
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