There are several common forms of opt-in email:

If opt-in email advertising is used, the material that is emailed to consumers will be "anticipated".

Opt-in email marketing may evolve into a technology that uses a handshake protocol between the sender and receiver.

Ideally, opt-in email advertisements will be more personal and relevant to the consumer than untargeted advertisements.

A squeeze page is a landing page created to solicit opt-in email addresses from prospective subscribers.

In addition to the email software side of the business, eCircle has a global opt-in email list rental network across a number of product areas.

Comm100 Email Marketing:bulk email software that helps users send opt-in email newsletters to subscribers.

Causecast was formed by Ryan Scott, who - as the co-founder of NetCreations - is widely considered the father of opt-in email marketing.

Opt-in email advertising, or permission marketing, is a method of advertising via email whereby the recipient of the advertisement has consented to receive it.

Upon signing up for an opt-in email subscription at PLNDR.com, consumers receive daily emails and can log in to see sales for the day.

The company provides software as a service (SaaS) solutions for email, mobile and social media marketing and offers opt-in email and lead generation media solutions.

Rosalind Resnick is an American consultant, real estate investor, journalist, author and entrepreneur credited with the creation of opt-in email, a permission-based form of email marketing.

The step of email address verification (confirmation) is considered by many anti-spam advocates to be the minimum degree necessary for any opt-in email advertising or other ongoing email communication.

Dunhill International List Company is a Boca Raton, Florida-based company, specializing in direct marketing lists, data file maintenance, opt-in email, telemarketing and creative services.

Opt-in email is a term used when someone is given the option to receive "bulk" email, that is, email that is sent to many people at the same time.

The site has a widespread global network including an opt-in email list of over 2 million people, and utilizes its 85,000-member global Karmaloop Rep Program, to drive online sales and build brand loyalty.

WebMD only uses opt-in email sign-up (you have to fill in a form or place a check mark in a box) to help make it easy for you to know exactly what you are signing up for.

NetCreations' development of opt-in email was a response to the prevalence of unsolicited email marketing, or Spam, which, in testimony to the Federal Trade Commission in 1997, Resnick characterized as an abuse of privacy.

While the company is best known for its search engine optimization services, it is also involved in search engine submission, search engine marketing, PPC, social media marketing, online reputation management, link building, opt-in email advertising and web design.

In addition to overt communication methods, technologies now also provide marketing systems the ability to do extensive lead nurturing activities through automation systems, which often include opt-in email listings, automated telephone dialing systems, or hard copy mailing lists to increase visibility, touch on customer need, and increase brand visibility.

He formerly operated a company based in Seattle, Washington which he is calling "Broadcast E-mail Service" that offers "mailing services" by contract as well as a software program which the site promises will allow the buyer to "email your Web site to 2,500,000 opt-in email addresses for free."