Re: [exim] authenticating all users.

>
> it would be cool, if the firewall rules would implement a UID option ..
> allow port 25 connections only if uid is in ( 0, 93 ) . That would
> really help.
>
A bit off topic but some do. For example, iptables has the owner module that allows filtering on OUTPUT and POSTROUTING chains based on uid and gid.