Tip 1: Send out themed, timely emails that correspond to pop culture and well-known events. Decorate your emails around holiday times to make them more relevant. If there is a major sports game going on, create flyers based on those two teams, sending out whichever one wins. Find out trending topics on Twitter and Google and incorporate your messages with these frequently visited ones.
Tip 2: Tweet and Facebook messages that bring followers to sign up for the newsletter or to mailing list opt-in page. Try and post new material through email blasts and newsletter in order to gain interest. You can create a tab in Facebook where followers can enter their information right through Facebook and be signed up to receive your emails.
Tip 3: Be Relevant. Know who is reading your content and what their interests are. Topics should include anything related to your business, or that could help your clients. Unless your business caters to one sex specifically, make sure your content includes material for men and women. Add check boxes with some interest choices to the newsletter sign up page; this way you will already know what information a new client is interested in receiving.
Tip 4: Get customers involved and hooked. Offer incentives through email blasts, including birthday coupons, referral prizes, holiday coupons and others. Post on social media sites the benefits and discounts that customers are able to receive through the email blast or newsletter.
Tip 5: Easy access. The easier it is for consumers to stay connected with your company, the more likely they are to do it. Get a text number that customers can send their email address to and automatically be a part of that mailing list. Post this information on all blogs and social media (example: Text your email address to 12121 to be placed on XYZ Companies mailing list).
Tip 6: Make sure emails are accessible via mobile phones. Many business professionals view all emails on their cell phones and if your text is embedded in an image, they might not be able see it. Add any text that is seen within an image, separately to the end of the email, for cell phone viewers.
Original Article From Mashable: http://mashable.com/2011/04/19/email-marketing-tactics/