Exchange 2010 not accepting mail (Cannot telnet port 25)

If you cannot telnet to port 25 internally to your exchange 2010 server you should try:

  • Navigating to the drive which exchange is installed, for example C:\ drive
  • Then navigate to Program Files\Microsoft\Exchange Server\V14\TransportRoles
  • Stop all Exchange related services
  • Rename the folder called 'data' to 'dataold'
  • Restart all exchange services 
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