Ich kenne POP Peeper. Das ist ein gutes Programm, das auch in deutsch erhältlich ist (siehe Website) mit vielen Features.

Primary Features
  • Easy Setup - accounts created from your existing email client(s)
  • Compatible with the following Server Types: POP3, Hotmail\MSN, Yahoo,
    Mail.com, MyWay, Excite, Lycos.com, RediffMail
  • Read and delete email without opening your email client
  • HTML Email Support
  • Password Protection
  • Message protection features including security from viruses and web bugs
  • Save or Open File attachments
  • No account limit -- notifies you of an unlimited number of accounts
  • Be notified of new email with visual and\or audible indicators
  • Extensive Help with useful tips and information

Quelle: http://www.poppeeper.com/