Ports Used by Exchange Server 2003

Port number	Service
25	Simple Mail Transfer Protocol (SMTP)
80	HTTP
88	Kerberos
102	MTA - X.400 connector over TCP/IP
110	Post Office Protocol (POP3)
119	Network News Transfer Protocol (NNTP)
135	Client/server communication RPC Exchange administration
143	IMAP
389	LDAP
443	HTTPS (SSL)
563	NNTP (SSL)
636	LDAP (SSL)
993	IMAP4 (SSL)
3268	Global Catalog
3269	Global Catalog

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