what is User Name and Password? [is it mail server related?]
Yes if you need to authenticate to the mail server to allow vrops to relay messages
what is sender email address? [we can use any random email or we have to use one already existing under our mail server?]
Random but meaningful made up address so you know where the mail came from.
I dont need authentication so all i filled in is SMTP host, port, sender email address and name. i left the rest default
