Always include a signature at the bottom of your emails, as it's one of the easiest ways to attract more traffic to your website. This signature should include your personal details, your company details, and an unsubscribe link. You can use your signature to link back to your website, and even to other products. Here's a sample signature:

Regards,
John Doe.
President - Company XYZ.
Visit our website at http://www.companyxyz.com
Unsubscribe from this newsletter at http://www.companyxyz.com/unsubscribe...