Hi guys,
Just switched over from one provider to MimeCast on a fairly unfamiliar system, and receiving in Mimecast the error: 4.3.2 Service not available, closing transmission channel
Can anyone help with this? Weird thing is that the Microsoft Remote Connectivity Analyzer works? But no other mail can get through and fails.
I wonder if it lays with Receive Connectors?
Any help much appreciated!
