we have a a vendor that set up a web page , and some of our users have credentials to login(username and password).
When they login, they can go to one of the Tabs, to test the send mail
the form asks for "Outbound Email server(SMTP)".
so users type our SMTP server MX record which is the MX record hosted on the internet ..
Now I am wondering, when users that are using that application send through the specified SMTP server, does the SMTP traffic come to our SMTP server inside the network and go out.?
I have seen several applications that asks for outgoing SMTP server such as HPInsignt manager, Vsphere Vcenter, so that they send alert...but these are most of the time inside the network...but Publicly to have an application that uses SMTP server to send SMTP traffic, I am not aware of that yet..