> >1) add to /etc/mail/sendmail.cf
> >
> >O AliasFile=/home/mailman/aliases
> 
> This assumes you're dedicating your machine to mailman...

You can add multiple alias files to that line...

i.e.

   O AliasFile=/etc/mail/aliases,/etc/mail/aliases.mj,/etc/mail/aliases.mailman

I like to keep majordomo and mailman aliases in separate files, as well
as any virtual domain stuff and .REDIRECTs.

Chris