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WIndows 10 update and NWP
This morning 12 April 2018, after a Windows 10 update, NWP connected to an ip in the 5 series so I switched off NWP and switched it On again and it connected to a 86 series ip, on both of these addresses I was not able to send/receive email.
Switch NWP OFF,
NWP connected to a 109 series ip, and email is back to normal.