Problem Sending Mail With Postfix

[Montag]

I've got Postfix SMTP server set up on a FreeBSD 7 box.  I'm receiving
mail just fine, and I can send mail to my other web accounts (gmail),
but my mail is getting rejected from the mailing lists.  Here is the
output from the local mail queue:

host mx1.free.bsd.org said: my.mywebsite.com: Helo command rejected:
Host not found (in reply to RCPT TO command))
freebsd-questions at freebsd.org

Any thoughts?  I typed "sendmail -bp" to print that, which is curious,
because I'm pretty sure sendmail is not running; Postfix should be
handling everything.

Appreciate the help,

montag
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"Give the people contests they win by remembering the words to more popular songs or the names of state capitals or how much corn Iowa grew last year. Cram them full of non-combustible data, chock them so damned full of 'facts' they feel stuffed, but absolutely 'brilliant' with information. Then they'll feel they're thinking, they'll get a sense of motion without moving."