Postfix doesn't recognize my domain

I'm setting up postfix so I can send mail from an SMF forum on a dedicated mac mini with a static IP address. Following the instructions in the postfix.org documentation I've set
mydomain = <mydomainname>.com
where <mydomainname> is as in www.<mydomainname>.com
but when I reload postfix I get:
$ sudo postfix reload
postfix: fatal: file /etc/postfix/main.cf: parameter mail_owner: unknown user name value: _postfix mydomain = <mydomainname>.com
How is postfix supposed to "know" my domain name?

It's not complaining about your domain. It's complaining about the username that Postfix is instructed to run as.
Given the specific message in the text it sounds like the mail_owner parameter is merging with the next line so it's seeing something like:
mail_owner = _postfix mydomain = <mydomainname>.com
the mydomainparameter should be on a separate line.
Edit the file /etc/postfix/main.cf and check these lines.

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Postfix doesn't recognize my domain

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