Can't send email while on VPN
I'm having an issue with users being able to send email while connected to a company VPN. Basically they can send email while not on the VPN but while on it, they can only recieve. Now i think i know what is going on but can figure away around it.
Im thinking that while on the VPN it is trying to go through the "back door" of the ISP SMTP server and it is being blocked because of the on going battle with spammers. Does anyone know a work around for this? can you just designate ports for the vpn so that i can keep 25 the local connection? Any help would be great!