When people install Debian (or any distro), they usually get a bunch of entries in /etc/aliases and various system accounts (/etc/passwd entries with UID < 1000) created by the packages they install.
I've noticed an increase in spammers targeting some of the more common ones. Can the number of aliases installed by default be reduced? Do any of the mailers (postfix, exim, etc) provide a convenient way to exclude delivery to system accounts by default, or to exclude these aliases and accounts from receiving mail from external senders? Could anybody share examples of how they do it or pointers to any blogs or wikis with examples? Could/should any more be done at the packaging level to minimize this problem or is it something that can only be done on a per-site basis? Regards, Daniel