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This script allows you to collect email addresses from your visitors, then you can send out news-letters or announcements to all of your members in the database. This script will check if an email address is already in the database before adding it in. Also, a member can unsubscribe directly from your website if he or she doesn't want to be on your list anymore. Fast and reliable, Header and footer stuff supported. The messages in header.txt and footer.txt will be printed on every outgoing mails to your visitors.
Price: Freeware

Integrate a complete email marketing system with your website for one low fee. smc MailList provides you with a turn-key solution to manage mailing list subscribers from your website and create, send and track email marketing campaigns! easy web based administration of your email list. Customizable subscription page, easily import and export list information, text and HTML email content capabilities, customizable subscription notification options, campaign monitoring feature to display effectiveness of campaign.
Price: 30 Day Free Trial/$49.95/$99.95