When to Use Your Email Signature for More Than a Sign-OffThe email signature can be a powerful marketing tool -- but it can quickly become an irritating vehicle of self-promotion.

Two years ago, Alaia Williams used a run-of-the-millemailsignature: title, company, phone number. But as an online business strategist, she wondered if she was overlooking an obviousopportunity. So she started adding to her signature, piece by piece.

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