Stop local emails being sent to relay host with postfix

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http://serverfault.com – I've recently signed up to SMTP2GO (smtpcorp). I've setup postfix on one of EC2 servers and have pointed it to my smtp2go account: relayhost = [smtpcorp.com]:2525 Now all my mail is being routed through SMTP2GO, but the issue is, that the 1000+ emails that are generated by cron job ect are being sent to SMTP2GO using the email address: [email protected] My question is, what would be the best way to stop all these "local" emails being routed to SMTP2GO? Thanks Martin My main.cf: smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no append (HowTos)