FAQ 

James Hammett helped figure this one out:

1. edit /etc/mail/sendmail.cf and un-comment the following line:
   O AliasFile=/etc/mail/aliases
2. create an /etc/mail/aliases file; mine looks like this:

   	#  Aliases in this file will NOT be expanded in the header from
   	#  Mail, but WILL be visible over networks.
   	#
   	#       >>>>>>>>>>      The program "newaliases" must be run after
   	#       >> NOTE >>      this file is updated for any changes to
   	#       >>>>>>>>>>      show through to sendmail.
   	#
   	#
   	# See also RFC 2142, `MAILBOX NAMES FOR COMMON SERVICES, ROLES 
   	# AND FUNCTIONS', May 1997
   
   	# Pretty much everything else in this file points to "root", so 
   	# you would do well in either reading roots mailbox or forwarding
   	# roots email from here.
   
   	root:   mark@zieg.com
   
   	# Basic system aliases -- these MUST be present
   	MAILER-DAEMON: postmaster
   	postmaster: root
   
   	# General redirections for pseudo accounts
   	bin:    root
   	daemon: root
   	games:  root
   	man:    root
   	news:   root
   	nobody: root
   	operator: root
   	pop:    root
   	system: root
   	toor:   root
   	usenet: news
   	uucp:   root
   	xten:   root
   
   	# BUSINESS-RELATED MAILBOX NAMES
   	info:           root
   	marketing:      root
   	sales:          root
   	support:        root
   
   	# NETWORK OPERATIONS MAILBOX NAMES
   	abuse:          root
   	noc:            root
   	security:       root
   
   	# SUPPORT MAILBOX NAMES FOR SPECIFIC INTERNET SERVICES
   	ftp:            root
   	ftp-bugs:       ftp
   	hostmaster:     root
   	webmaster:      root
   	www:            webmaster

3. run "sendmail -bi" to activate the new aliases.
4. if you had previously defined a ".forward" in /private/var/root, you should now be able to delete it.