Norval had complained about not getting his mail.
I wasn't getting texts sent to 9024990488@txt.bell.ca
Anything going through protection.outlook.com was blocked
Huge -- almost 1000 -- queue built up on mercury.
The vast majority was, couldn't connect to port 25 on the recipient MX machine.
The problem: kimsufi itself had installed an anti-spam block.
Turn it off with this tool: