POP3/SMTP
POP3-compliant email systems are supported for incoming email message routing. Simple Mail Transfer Protocol (SMTP) and Exchange web services through Exchange Online are the only transport protocols supported for outgoing email message routing.
Note
When you use the Forward mailbox option on the User form, the POP3 email server must provide support where an email message can be sent as an attachment to another email message.
If you install the Microsoft Dynamics CRM Email Router to connect to a POP3-compliant or SMTP server, the following standards are required:
POP3: RFC 1939
SMTP: RFC 2821 and 2822
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