- 411i Services
 - Provides opt-in email marketing lists and address appending to postal addresses. - 50MillionEMailMarketing.Com
- Offers direct bulk email packages including CD-ROMs, software, and e-books.
- Admail.net Advantage
- Provides online opt-in email marketing tools for database, campaign, and customer contact and profile management, custom email layouts, and rapid deployment.
- ADSaturation
- Offers personalised and targeted email.
- Benchmark Email
- Do-it-yourself email marketing service that makes it easy to create professional HTML email campaigns.
- Big Email Marketing
- Opt-in email lists for sale from Big Email Marketing. Provides email marketing and advertising solutions that include the software needed to send out emails for free.
- BoldFish
- Provides high-volume sending capability with database integration for opt-in marketing.
- Bulk Email Ads
- Bulk Email Master
- Offers spam free bulk e-mail service.
- ChooseYourMail
- Ethical, opt-in, non-spam email product information system. Home of the Spam Recycling Centre.
- Connectiv Media, Inc.
- Provides businesses insight and tools on how to create, write, design, market, and publish an email newsletter.
- Connectus
- Permission marketing company providing closed loop e-marketing solutions.
- Constant Contact
- Offers a do-it-yourself email marketing service that builds and manages opt-in email lists. By Roving Software, Inc.
- CoverClicks
- Performance-based email marketing company.
- DataDog Interactive Marketing
- Specialises in internet marketing services such as email list building, email marketing programmes, search engine optimisation, and integrated marketing programmes.
- Digital Harvest Data Services
- Offering email append services and tips.
- Direct E-Mail List Source
- Advertise by direct email without spamming. Web directory of 1,000's of voluntary and opt-in e-mail lists.
- e-List Marketers
- Full service opt-in email marketing firm providing clients with access to any target market.
- E@symail Interactive
- Provides permission email list brokering and campaign management services.
- EliteEmail.com
- Create, send, and track opt-in email marketing campaigns without any technical skills. Includes full mailing list management and real-time reports.
- Email Deuce
- Offers opt-in bulk email marketing services.
- Email Marketing Company
- Internet business marketing solutions via targeted opt-in email lists for effective online advertising.
- Email4Marketer.com
- Offers downloadable opt-in email lists and Internet marketing resources.
- EmailMaestro.com
- Offers a permission based double opt-in email marketing service.
- EmailResults.com
- Database of opt-in email lists.
- EmailResults.net
- Provides Internet marketing services.
- EmailZipcode
- EmailZipCode.net provides customers the ability to purchase opt-in email leads by zip code. All records come complete with email, name, address, gender, and source of opt-in.
- emediaUSA
- Business to business email marketing company publishes opt-in email bulletins covering a range of markets, including technology, general business management, finance, marketing, HR, and more.
- eROI Email Software & Design
- EROI's email marketing campaign management services include planning, design, and list management. Also offers email marketing software to enable clients to build, send, and track emails.
- Estrela Marketing Solutions
- The opt-in email pros of Estrela Marketing Solutions offer effective online marketing services to businesses both large and small.
- eZined.com
- Covers a range of interests from comedy to lifestyles to computing.
- Fancyetools.com
- Selling In Touch 2001 opt-in list software.
 FlyingPost
- Provider of online direct marketing and data mining services.- Focalex, Inc.
- Targets and acquires customers through permission marketing. Also offers revenue by building mailing lists.
- FrogSolutions
- Source for targeted opt-in email marketing lists for instant downloading.
- Havoc Interactive Marketing Studio
- Specialists in website design and development. Havoc Interactive also offers multimedia design services, custom website management systems, and email marketing services.
- HomeGrown Advertising
- Offers fax broadcasting and opt-in email services.
- iEntry, Inc.
- Permission marketing via email newsletters.
- List-Universe.com Ad Network
- Outsourced advertising sales for email newsletter and list publishers, and marketing services for advertisers interested in reaching targeted audiences via opt-in email.
- Lyris
- Develops software and services for email management.
- MailChimp
- DIY email marketing service that allows companies to send everything from simple HTML newsletters to advanced email marketing campaigns. MailChimp handles delivery, tracking, list management, and reports.
- MailMonster.com
- Provides opt-in email marketing services for businesses featuring a web-based application for creating and sending customised HTML emails.
- Mailround
- Allows emailers to earn rewards when sending and receiving messages containing advertising stamps.
- NetCreations, Inc.
- Specialises in opt-in email direct marketing services.
- North American Mailing Associates (NAMA)
- Offers several lists to choose from. Also provides a variety of online marketing services.
- Opt In Inc.
- Provides permission based email marketing.
- Opt-in News
- Industry trade publication and news network.
- Opt-In Source
- Ad exchange matching buyers and sellers of permission email marketing solutions.
- Opt-in.co.uk
- Specialise in data capture and increasing conversion rates and offer marketing lists, tools, and other services.
- Opt-Media
- Specialises in helping website owners earn revenue through a viral Tell A Friend programme.
- PermissionDirect.com
- Manages and brokers targeted opt-in email lists for online direct marketing campaigns.
- PostMaster Direct
- Targeted, voluntary email mailing lists on thousands of topics.
- rightoffers.com
- Direct email service in which offers are sent after completing a survey.
- Snipermail.com
- Delivers targeted text, HTML, and rich media ads to double verified opt-in email lists for ad agencies and list brokers.
- StreamSend Email Marketing System
- Offers permission-based email marketing services.
- SubscriberMail
- Email marketing service provider, with tools to help create and send targeted email campaigns.
- Tagetmails.com
- Providing permission-based email marketing services.
- Targeted Opt In Email Marketing
- E-mailing lists for Internet marketing and advertising.
- TargitMail.com
- Offers ad agencies the ability to offer clients targeted email advertising based on audience participating recipients.
- TKL Interactive
- Provides permission based opt-in email names and comprehensive targeted campaign management services directly to marketers and ad agencies.
- Traffic Stream, The
- Offers targeted website traffic packages for mainstream, casino, adult, and country specific sites through pop under advertising and opt-in email marketing.
- Web Traffic Marketing
- Spam-free email marketing service with tracking.
- Whitehat.com
- Enables direct email marketers to engage in ethical targeted e-marketing.
- YesMail
- Permission email marketing network with tracking, reporting, and list management.
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