Ports used by Exchange Server

35 – RPC
53 – DNS
25 – SMTP
110 – POP
143 – IMAP
993 - IMAP4/SSL
995 - POP3/SSL
587 – Secure SMTP
443 – https
80 - http
64327 - DAG,
50636 - Edge Sync LDAP,
3268/TCP - (LDAP GC),
64327 - Seeding & Log shipping (customizable)
389/TCP/UDP (LDAP),
88/TCP/UDP (Kerberos),
808/TCP - Mailbox Replication Service (MRS)