Also look at SI 103 .. SI 108 which are internal timers to close socket after a period of silence.
Try disabling your timer networks and setting SI 105 to 600 to achieve the same results. If your system is the Master use SI 109. If you open the Help and search for "SI 105" you can navigate your way to a more thorough description.
You can have up to four sockets on a Vision. But that's not your problem.
To use the SMTP protocol the mail sender must also be capable of SSL (secure socket layer) encoding to use outlook:
Almost all of the email services (gmail, etc) have gone to SSL which was conceived and implemented after the Vision product was released.
I have brought this up to the Creators and this is a complex problem that is not going to be added to the Vision OS.
So you can't send email from the Vision unless you have your own non-SSL email server. You'll have to go to a UniStream if you want to send email this way.
I know what you are asking. However, as a sort of backup.......
Doesn't your modbus connection/module/gizmo at the pump end have user settable I/O preferences that you can make them switch to if comms are lost after X minutes?