Email marketing has evolved rapidly alongside the technological growth of the 21st century. Prior to this growth, when emails were novelties to the majority of customers, email marketing was not as effective. In 1978, Gary Thuerk of Digital Equipment Corporation (DEC) sent out the first mass email[1] to approximately 400 potential clients via the Advanced Research Projects Agency Network (ARPANET). This email resulted in $13 million worth of sales in DEC products, and highlighted the potential of marketing through mass emails. However, as email marketing developed as an effective means of direct communication, users began blocking out content from emails with filters and blocking programs. In order to effectively communicate a message through email, marketers had to develop a way of pushing content through to the end user, without being cut out by automatic filters and spam removing software.
Due to the massive growth of the Internet, most countries have passed legislation to prevent companies from sending unsolicited emails. These laws determine what is and what is not considered acceptable email correspondence, and enforce restrictions on email communications. In the United States and Europe, for example, bulk email must contain an accurate from field and subject line, and the email content must include the sender’s physical address. In addition, a blast email must also offer its recipients the opportunity to unsubscribe from the email list — and such requests must be met within a specified period of time. As a result of these laws, it is very important for companies to maintain an updated list of subscriptions and cancellations at all times, and avoid sending out email that appears to be spam.
The best time to send an email blast depends a little on the best time you think your recipients would like to receive it. Most business contacts receive an average of 75 emails per day. To make sure they have the time to review (and hopefully, read) your email, try to have your email blast arrive on Tuesday Mornings between 8am and 11am. Mondays (especially after holidays) is typically a day where most contacts are catching up on email from the weekend. Fridays are difficult, as most contacts are wrapping up work from the week and may not have the time to look at your message. Even if they do find time to read it, they may have forgotten about you, and your message, by the next Monday. If Monday is a holiday, time your email blast to arrive on a Wednesday Morning after the holiday. Mornings are best as most people are planning or finalizing their day in the mornings. This gives them more time to react to your email message that same day. Afternoons and evenings are typically too late in the workday to encourage immediate action.
Internet service providers (GMail, Yahoo, etc.) and anti-spam organizations create the spam traps to prevent spam from reaching people’s inboxes. The important thing for everyone to remember is if you use a purchased list, you are technically spamming the people on that list. Spam is unsolicited email and those people did not request your information.
Electronic mail , often abbreviated as email or e-mail , is a method of exchanging digital messages, designed primarily for human use.. An electronic mail message consists of two components, the message header , and the message body , which is the email's content. The message header contains control information, including, minimally, an originator's email address and one or more recipient addresses. Usually additional information is added, such as a subject header field.. E-mail systems are based on a store-and-forward model in which e-mail computer server systems accept, forward, deliver and store messages on behalf of users, who only need to connect to the e-mail infrastructure, typically an e-mail server, with a network-enabled device (e.g., a personal computer) for the duration of message submission or retrieval. Rarely is e-mail transmitted directly from one user's device to another's. Wikipedia
The downside of Every Door Direct Mail Service is that, besides the location of the recipient, you don’t know anything else about them. If you would like to be able to further target the recipients based on other factors, then you will need to rent a third party mailing list. There are many places where you can go to purchase third party list that is tailored to your specific need. Experian, DirectMail, and InfoUSA being some of the more popular options.

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. 

Mobile advertising is growing rapidly for several reasons. There are more mobile devices in the field, connectivity speeds have improved (which, among other things, allows for richer media ads to be served quickly), screen resolutions have advanced, mobile publishers are becoming more sophisticated about incorporating ads, and consumers are using mobile devices more extensively.[24]:14 The Interactive Advertising Bureau predicts continued growth in mobile advertising with the adoption of location-based targeting and other technological features not available or relevant on personal computers.[24]:14 In July 2014 Facebook reported advertising revenue for the June 2014 quarter of $2.68 billion, an increase of 67 percent over the second quarter of 2013. Of that, mobile advertising revenue accounted for around 62 percent, an increase of 41 percent on the previous year.
It's practically impossible to overstate the importance of direct mailing lists to the success of your direct mail program. The correct mailing list will contain your most valuable prospects. The more careful you are in analyzing and selecting direct mailing lists, the better your chances for success. There are several different categories of mailing lists available on the market today ranging in cost and appropriateness for your market. When you are considering what type of mailing list to buy consider the following three types:
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