to summarize, looks like /etc/aliases is better for us?  i'll switch
	back to /etc/aliases if noone objects.

	- /etc/aliases
		postfix is happy, db format is usually compatible (unless
		postfix and sendmail are configured differently)
		just a matter of sendmail.cf change
	- /etc/mail/aliases
		postfix is not happy
		may need more twisted upgrade instruction

	{free,open}bsd are using /etc/aliases and /etc/mail/sendmail.cf with
	sendmail 8.10.

itojun