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[Applies to: Microsoft Dynamics CRM 4.0]

In addition to Exchange Server, POP3 e-mail systems are supported for incoming e-mail message routing.


  • When you use the Forward Mailbox option on the User form, the POP3 e-mail server must provide support where an e-mail message can be sent as an attachment to another e-mail message.
  • SMTP is the only transport protocol that is supported for outgoing e-mail message routing.

If you install the Microsoft Dynamics CRM E-mail Router to connect to a POP3 and SMTP server, the following standards are required:

  • POP3: RFC 1939
  • SMTP: RFC 2821 and 2822

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