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  • http://mailtester.com/
    MailTester.com - Online tool to test an e-mail address. Find out if is valid, why it bounces or what type of mailserver the mailbox is on.
  • http://www.google.com/postini/
    Postini - In-line infrastructure for pre-processing email messages in real time. Allows email management applications to be integrated into any SMTP email system.
  • http://www.slugmail.com
    Slugmail - An email based reminder service.