E-marketing is a process of planning and executing the conception, distribution, promotion, and pricing of products and services in a computerized, networked environment, such as the Internet and the World Wide Web, to facilitate exchanges and satisfy customer demands. It has two distinct advantages over traditional marketing. E-marketing provides customers with more convenience and more competitive prices, and it enables businesses to reduce operational costs.
You want to have a single purpose for your direct mail piece. Often times the goal of a direct mail campaign is to get the recipient to buy a product or use a service. Other goals can be to send people to your website, get people to enter a contest, or let people know about an upcoming event. Knowing your goal will help you formulate what you want the direct mail piece to say. You also need to consider what the recipient stands to gain from the letter.
As we wrote in an earlier post, 7 Email List Hygiene Best Practices for a Fresh & Clean List, it’s far better to let people unsubscribe – to make it really easy for them to unsubscribe – than to keep them on your list. Don’t blast people – force people – into getting your email messages. Email marketing at its best is not mass advertising. It is tailored, persona-driven, relationship-building, inbound marketing.
Direct mail is a type  of direct marketing in which businesses send letters, postcards or other promotional materials to past, current or potential customers or clients. Direct mail campaigns may be targeted to either a consumer or business or both.  In many cases, the mailing is directed to a target demographic (i.e. home owners) or geographic market (i.e. a specific neighborhood). In most cases, it's mass or bulk mailing, but you can send direct mail in smaller quantities as well.

Particular groups of customers can be targeted or even individuals. Offering individual customers special deals on merchandise and/or services on the customer's birthday, for instance, is one example of email marketing personalization. (A restaurant might send an email to customers on their birthday offering 50% off an entree,) Email marketing helps a business develop and maintain a relationship with a customer over time that hopefully results in increased sales and increased customer loyalty. 
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