> What the message suggests to me is that the other machines in your
> domain should be using address rewriting if they are sending from
> unroutable addresses.
Except that there are multiple domains hosted from my network. Which
should I use? BTW, this occurs even from hosts which have publicly
routable IP addresses, probably because they are not running a publicly
accessible mail server. The point is that I only experience this
problem with Alioth and SourceForge lists, where they use braindead call
back mechanism to try and reach the host that originated the message.
Since I am using mutt and I simply have postfix set to use a smarthost,
which does have a publicly accesible postfix running.