[Exim] SMTP authentication

I just got SMTP authentication working on my server, and I tested to see if
I could then authenticate to the server to relay mail out of it - and it let
me (which is what I wanted), but it left me wondering why.

Does Exim automatically enable a user who is authenticated to relay out of
the server? Is this the only reason for having the authentication (if so,
then I can see why it would only change the relay setting)?

I was thinking that I would have to do something else to then add that user
who authenticated to the list of hosts who can relay, but I guess I don't
have to?

Eli.

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