Yes, you are right! :e I changed it to "gateway.local". I am still getting the same error messages:
Aug 30 17:53:30 gateway sm-mta[1373]: r7S05Y9j041529: to=<root@gateway.home.com>, delay=2+14:47:55, xdelay=00:00:00, mailer=esmtp, pri=17317777, relay=gateway.home.com. [66.114.124.140]...