Hi,
My IP Address was removed from Spamhaus last week and Outlook functioned perfectly. The problem has now returned and, checking Spamhaus, I find the my IP is listed in CSS for Wednesday Sept 16 at 18:52 and listed in CBL for Friday Sept 18 at 08:55.
The puzzle is: I have been away from Tuesday, Sept 15 until today, Friday Sept 18 at around 17:10. During my absence, the PC and laptop have been switched off and the phones and tablets have been away from the house. The only thing left connected to the router is my HIVE controller for the central heating. Could this be causing the problem?