E-mail marketing (on the Internet) is popular with companies for several reasons:

• A mailing list provides the ability to distribute information to a wide range of specific, potential customers at a relatively low cost.
• Compared to other media investments such as direct mail or printed newsletters, e-mail is less expensive.
• An exact return on investment can be tracked ("track to basket") and has proven to be high when done properly. E-mail marketing is often reported as second only to search marketing as the most effective online marketing tactic.
• The delivery time for an e-mail message is short (i.e., seconds or minutes) as compared to a mailed advertisement (i.e., one or more days).
• An advertiser is able to "push" the message to its audience, as opposed to website-based advertising, which relies on a customer to visit that website.
• E-mail messages are easy to track. An advertiser can track users via autoresponders, web bugs, bounce messages, unsubscribe requests, read receipts, click-throughs, etc. These mechanisms can be used to measure open rates, positive or negative responses, and to correlate sales with marketing.
• Advertisers can generate repeat business affordably and automatically.
• Advertisers can reach substantial numbers of e-mail subscribers who have opted in (i.e., consented) to receive e-mail communications on subjects of interest to them.
• Over half of Internet users check or send e-mail on a typical day.
• Specific types of interaction with messages can trigger (1) other messages to be delivered automatically, or (2) other events, such as updating the profile of the recipient to indicate a specific interest category.
• E-mail marketing is paper-free (i.e., "green").

Many companies use e-mail marketing to communicate with existing customers, but many other companies send unsolicited bulk e-mail, also known as spam.

Internet system administrators have always considered themselves responsible for dealing with "abuse of the net", but not "abuse on the net". That is, they will act quite vigorously against spam, but will leave issues such as libel or trademark infringement to the legal system. Most administrators possess a passionate dislike for spam, which they define as any unsolicited e-mail. Draconian measures—such as taking down a corporate website, with or without warning—are entirely normal responses to spamming. Typically, the terms of service in Internet companies' contracts permit such actions; therefore, the spammer often has no recourse.

Illicit e-mail marketing predates legitimate e-mail marketing. On the early Internet (i.e., Arpanet), it was not permitted to use the medium for commercial purposes. As a result, marketers attempting to establish themselves as legitimate businesses in e-mail marketing have had an uphill battle, hampered also by criminal spam operations billing themselves as legitimate ones.

It is frequently difficult for observers to distinguish between legitimate and spam e-mail marketing. First, spammers attempt to represent themselves as legitimate operators. Second, direct-marketing political groups such as the United States Direct Marketing Association (DMA) have pressured legislatures to legalize activities that some Internet operators consider to be spamming, such as the sending of "opt-out" unsolicited commercial e-mail. Third, the sheer volume of spam has led some users to mistake legitimate commercial e-mail for spam. This situation arises when a user receives e-mail from a mailing list to which he/she subscribes. Additional confusion arises when both legitimate and spam messages have a similar appearance, as when messages include HTML and graphics.

One effective technique used by established email marketing companies is to require what is known as the "double opt-in" method of requiring a potential recipient to manually confirm their request for information by clicking a unique link and entering a unique code identifier to confirm that the owner of the recipient email address has indeed requested the information. Responsible e-mail marketing and autoresponder companies use this double opt-in method to confirm each request before any information is sent out.

A report issued by the e-mail services company Return Path, as of mid-2008 e-mail deliverability is still an issue for legitimate marketers. According to the report, legitimate e-mail servers averaged a delivery rate of 56%; twenty percent of the messages were rejected, and eight percent were filtered.

Due to the volume of spam e-mail on the Internet, spam filters are essential to most users. Some marketers report that legitimate commercial e-mail messages frequently get caught and hidden by filters; however, it is somewhat less common for e-mail users to complain that spam filters block legitimate mail.

Companies considering the use of an e-mail marketing program must make sure that their program does not violate spam laws such as the United States' Controlling the Assault of Non-Solicited Pornography and Marketing Act (CAN-SPAM), the European Privacy and Electronic Communications Regulations 2003, or their Internet service provider's acceptable use policy. Even if a company adheres to the applicable laws, it can be blacklisted (e.g., on SPEWS) if Internet e-mail administrators determine that the company is sending spam.

The CAN-SPAM Act of 2003 authorizes a US$11,000 penalty per violation for spamming each individual recipient. Therefore, many commercial e-mail marketers within the United States utilize a service or special software to ensure compliance with the Act. A variety of older systems exist that do not ensure compliance with the Act. To comply with the Act's regulation of commercial e-mail, services typically require users to authenticate their return address and include a valid physical address, provide a one-click unsubscribe feature, and prohibit importing lists of purchased addresses that may not have given valid permission.

In addition to satisfying legal requirements, e-mail service providers began to help customers establish and manage their own e-mail marketing campaigns. The service providers supply e-mail templates and general best practices, as well as methods for handling subscriptions and cancellations automatically. They also provide statistics pertaining to the number of messages received and opened, and whether the recipients clicked on any links within the messages.

The CAN-SPAM Act was recently updated with some new regulations that went into effect on July 7, 2008.

Opt-in e-mail advertising, or permission marketing, is a method of advertising via e-mail whereby the recipient of the advertisement has consented to receive it. This method is one of several developed by marketers to eliminate the disadvantages of e-mail marketing.

Opt-in e-mail marketing may evolve into a technology that uses a handshake protocol between the sender and receiver. This system is intended to eventually result in a high degree of satisfaction between consumers and marketers. If opt-in e-mail advertising is used, the material that is e-mailed to consumers will be "anticipated". It is assumed that the consumer wants to receive it, which makes it unlike unsolicited advertisements sent to the consumer. Ideally, opt-in e-mail advertisements will be more personal and relevant to the consumer than non-targeted advertisements.

A common example of permission marketing is a newsletter sent to an advertising firm's customers. Such newsletters inform customers of upcoming events or promotions, or new products. In this type of advertising, a company that wants to send a newsletter to their customers may ask them at the point of purchase if they would like to receive the newsletter.

With a foundation of opted-in contact information stored in their database, marketers can send out promotional materials automatically. They can also segment their promotions to specific market segments.

Search engine marketing, or SEM, is a form of Internet marketing that seeks to promote websites by increasing their visibility in search engine result pages (SERPs). According to the Search Engine Marketing Professional Organization, SEM methods include: search engine optimization (or SEO), paid placement, contextual advertising, and paid inclusion. Other sources, including the New York Times, define SEM as the practice of buying paid search listings.

In 2006, North American advertisers spent US$9.4 billion on search engine marketing, a 62% increase over the prior year and a 750% increase over the 2002 year. The largest SEM vendors are Google AdWords, Yahoo! Search Marketing and Microsoft adCenter. As of 2006, SEM was growing much faster than traditional advertising and even other channels of online marketing.

 

 

As the number of sites on the Web increased in the mid-to-late 90s, search engines started appearing to help people find information quickly. Search engines developed business models to finance their services, such as pay per click programs offered by Open Text in 1996 and then Goto.com in 1998. Goto.com later changed its name to Overture in 2001, and was purchased by Yahoo! in 2003, and now offers paid search opportunities for advertisers through Yahoo! Search Marketing. Google also began to offer advertisements on search results pages in 2000 through the Google AdWords program. By 2007, pay-per-click programs proved to be primary money-makers for search engines.

Search engine optimization consultants expanded their offerings to help businesses learn about and use the advertising opportunities offered by search engines, and new agencies focusing primarily upon marketing and advertising through search engines emerged. The term "Search Engine Marketing" was proposed by Danny Sullivan in 2001 to cover the spectrum of activities involved in performing SEO, managing paid listings at the search engines, submitting sites to directories, and developing online marketing strategies for businesses, organizations, and individuals.

Paid search advertising has not been without controversy, and the issue of how search engines present advertising on their search result pages has been the target of a series of studies and reports by Consumer Reports WebWatch. The Federal Trade Commission (FTC) also issued a letter in 2002 about the importance of disclosure of paid advertising on search engines, in response to a complaint from Commercial Alert, a consumer advocacy group with ties to Ralph Nader.