Now-a-days with SPF records and such, it's always a good idea to limit postfix to use the ip address specified in the spf record to prevent your mail from being marked as spam. This is only necessary if your server has more that one ip bound to it.
In /etc/postfix/main.cf add:
smtp_bind_address = 111.222.333.444
This will limit your postfix server to using the ip specified.
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