ons, 09.04.2003 kl. 18.38 skrev Chris Edwards:
> Fred sends a mail to some remote destination on the internet, using
> envelope sender "support".
Then you have an alias for support? Then it would be accepted.
> Remote server somewhere out on the internet
> fails this message for some reason, generating a bounce destined for
> "support".
Quite.
> Our site MX expands support into fred+jim and delivers to the
> internal messagestore server hosting both fred and jim.
They exist? Then there is no problem.
> If the internal
> messagestore server enforces the above ACL, the legit bounce message will
> be rejected.
1: Different server;
2: Different ACLs
> I guess the solution is simply to only have this ACL on the MX machines,
> (only checking bounces coming in from remote hosts).
The ACL specifies that the client server has already done a helo/ehlo
and a mail from, then does a rcpt to: user, gets "no such user", then
does "o.k., then I'll try something else.
How many times may the client do this? A client MTA should know, before
it makes the conection, for whom the message is intended and the server
should have an account, even if that is an alias or a group account.
Tony
--
Tony Earnshaw
e-post: tonni@???
www: http://www.billy.demon.nl
