I just noticed an automated backup script wasn't emailing me status reports after upgrading a machine from server 10.5 to server 10.6.
It runs as cronjob and echo's to terminal and cron conducts the email.
I tested with: echo "test" | mail "my@email.com" and it never left the machine. I turned on tcpdump and confirmed it wasn't even attempting to make a network connection. "mail" (/usr/bin/mail) is what cron uses to email output. Just typing "mail" says there's no mail for me so it didn't bounce locally...
So is mail broken in 10.6 server? I know it works on 10.6 client. The Mail subsystem on this server is NOT turned on or configured in the slightest.
