> You can allow only specific e-mail addresses to send mail through your
> server.
Those can be forged.
If you don't filter by SMTP AUTH, originating IP address, SSH tunnelling, or
some other mechanism, then you ARE an open relay.
> > As it must be reachable from the Internet, I cannot user the
> > RemoteAddrNotInNetwork protection. In addition, the server runs inside a
> > firewall which permits ingoing and outgoing SMTP, but blocks HTTP. Is it
> > possible to use InSpammerBlacklist with such restrictions?
Can you install sshd on the server, and tunnel into it when you need to send
e-mail?
--- Noel
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