it's not an incoming limit or an outgoing limit. what I am refering to is the number of individual email accounts that the system will allow you to have.
I'm not claiming to want or need control of people sending mail to the server from remote locations. All the work is basicly already done for me.
I'm running off the "Envelope" header that gets set when mail is sent to my server by the remote mail server ( be that coming from 'mail.example.com', 'mail.test.com' or whatever ). all hosts set this header on outgoing messages.