Do you have anything (error messages) logged by amavis? Possibly in a
log by itself if not in mail.log? If you start amavisd-new using
'amavisd debug' (after stopping amavisd) (or amavisd-new debug), what
version of Net::Server does that show you are running (it lists
versions of helper programs). I'm looking to see if you have ever
installed 0.91 or 0.92 from source or CPAN which would obscure the
Debian version(s). As you have found out, Net::Server 0.87 0.90 0.93
or 0.94 should work fine with 2.4.1.