When you meet people face to face for any reason, ask for their business card. Offer yours. Set a glass bowl on the counter in your store or the reception desk in your office, and ask visitors to drop their cards in it. Offer some incentive to do so — a free product or service, gift card, etc. Use your own business cards to further drum up emails; add an offer on the back of your card that encourages people to sign up to receive your emails.
How can I make my website look attractive
Your blog provides a great way to build a personal relationship with customers and prospects — and to gather their email addresses. Consistently end blogs with a call to action that encourages readers to sign up for your email messages. Require blog visitors to provide an email list in order to leave comments, and set it up so that they have to actively opt out if they don’t want their email address included on your mailing list.