A protocol is a standard method used by communication channels to transmit information correctly. An email client and a mail server can exchange information with each other using the following protocols:
Internet Message Access Protocol (IMAP)
IMAP over Secure Sockets Layer (SSL) (IMAPS)
Post Office Protocol v3 (POP3)
POP3 over SSL (POP3S)
Simple Mail Transfer Protocol (SMTP)
Hypertext Transfer Protocol (HTTP)
When the PowerCenter Integration Service is running on Windows or UNIX, you can retrieve emails from mail servers such as, Microsoft Exchange Server using MAPI, IMAP, IMAP over SSL, POP3, or POP3 over SSL protocols.