The below-mentioned ports must be opend in the firewall for Hosted Exchange.

Protokoll/ PortAnwendung
TCP 443
  • Microsoft Outlook 2013, 2010 and Outlook 2007
  • Microsoft Entourage 2008 EWS/ Outlook 2011 for Mac
  • Outlook Web App
TCP 587*
  • SMTP relay
TCP 143/993*
  • Simple IMAP4/ IMAP4S
TCP 995**
  • POP3
TCP 80 and 443*
  • Simple Exchange
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