I chose one particular users computer and was determined to find a difference.
Check OS version, check FMP version, checked plugging version, check security/firewall settings, checked it's ping and networks speeds. Everything seems normal.
Hang on, I did not check the DNS
... time passes ...
My computer was using Google free dns (8.8.8.8)
There users are set to the router default (AT&T ?)
If I set the users to 8.8.8.8, connections are fast. Back to router default, connections are again slow.
I change the router to use 8.8.8.8 and the user connection are still slow if they are set to the router default.
This leads me to believe we have a in-house dns issue. It doesn't seem to affect anything except the EmailConnect function.
My temp solution is to set the users to get their dns directly from Google (8.8.8.8)
Kyle