Postfix SASL+submission relay access denied

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http://serverfault.com – I have been at this for a couple of hours, and apparently I am missing something in newer postfix versions. I have the server set up, and it works locally but when I try to send from a remote network through the submission port, I always get "Relay access denied". I have manually checked that sasl auth and tls are both working properly. Here is my main.cf: queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix default_privs = nobody myhostname = host.mydomain.com mydomain = mydoma (HowTos)