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PortExchange On PremisesExchange OnlinePurpose
25/TCP(error)(tick)Mail routing
80/TCP(tick)(tick)
110/TCP(tick)(error)POP3 Clients
143/TCP(tick)(tick)IMAP4 Clients
443/TCP(tick)(tick)

Encrypted Web Connections of:

  • Autodiscover service
  • Exchange ActiveSync
  • Exchange Web Services (EWS)
  • Offline address book (OAB) distribution
  • Outlook Anywhere (RPC over HTTP)
  • Outlook MAPI over HTTP
  • Outlook on the web (formerly known
    as Outlook Web App)
587/TCP(tick)(tick)SMTP Clients
993/TCP(tick)(tick)IMAP4 Clients
995/TCP(tick)(tick)POP3 Clients