Problem
I can't send emails via outMail through a VPN connection?
Solution
It is assumed in this article that you can send emails via outMail normally when not connected to a VPN.
Some ISP's and VPN service providers filter/block/redirect the lower TCP ports, SMTP ports being some of them.
Try changing your outbound SMTP port in the outgoing settings to use one of our alternative ports such as 2525 or 8025.