Bug#478716: Too easy to create an open SMTP relay?

[Daniel James]

Package: exim4-config
Version: 4.63-17
Severity: normal

When running dpkg-reconfigure exim4-config on an Etch server I noticed 
that selecting the type of mailserver as 'smarthost' but then leaving 
the field for the address of the smarthost blank turned the server into 
an open SMTP relay. Would appreciate it if someone could try to 
reproduce this.

Cheers!

Daniel