How do I setup a user to relay on Protector? We have an internal mail host, MX record points to protector ...outlook unable to connect to send.?
For mobile users it should not be different than for wired users. They must have a mail client on their mobile and that mail client must be configured with a smtp server for outgoing mail. Mobile users should point to the internal mail host for outgoing mail.
If the problem is that the mail host does not have a public ip and mobile users are not connected through the corporate lan, it can only be fixed if the mx record points to a public ip and the mail host is on that ip.
There is no issue with office365, but the way they use it must be the opposite: they don't have to add O365 as relay server in the protector, but they must configure O365 to use the protector as MX server. And they must use the protector as relay server. This is why it must have a public IP.