Pointing cron MAILTO at localhost

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http://www.ozzu.com – This is all happening behind a router on systems I have beside me at home. The thing Im wondering about is whether mail sent to username@localhost is going outside of my home network to get delivered. Im retrieving it via POP3 on another system on the network. I basically just have this setup for the cron emails so they dont have to be routed through my ISPs SMTP relay and then to my gmail account.Heres the headers from a cron job email Ive retrieved via POP3, does it look like the communication is staying behind the router ?It does to me, but the mention of rr.com has me uns (HowTos)