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Above is example of command someone used to successfully direct to subdomain but when I try it I get postconf: fatal: missing '=' after attribute name which makes no sense to me when clearly the equal sign is there.

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Are there spaces in your command line around the equal sign? Seems to me that there must not be spaces. – wollud1969 Dec 12 '12 at 11:37

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Use

postconf -e "postfix_mydestination = localhost, blah.deblah.com.au"

Note the quotes and the comma (it's comma separated). Also note you're not editing the main mydestination here, but the postfix_ instance one. Not sure if that's what you actually want.

You need quoting because of the witespace around the equal sign. Just read from the manpage postconf(1):

-e     Edit  the main.cf configuration file, and update parameter settings with
       the "name=value" pairs on the postconf(1)  command  line.  The  file  is
       copied  to  a temporary file then renamed into place.  Specify quotes to
       protect special characters and whitespace  on  the  postconf(1)  command
       line.
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does this make it so directed at subdomain? – freja Dec 12 '12 at 12:06
because in main.cf the hostname had to put main domain because that is what som1 told me in here to do or rather they said use destination for subdomains – freja Dec 12 '12 at 12:07
don't i need a db before anything will work? omg they need simple tutorials and not entire novels to read on this – freja Dec 12 '12 at 12:09
that syntax worked thanks but have no idea what it did- how can I test mail in command line? – freja Dec 12 '12 at 12:16
The values you put in mydestination are the recipient domains it will accept for a local transport. Read manpages, practice with tutorials and learn. This is really basic Postfix configuration. In large virtual domain/alias setups a database might be nice, but start using plain configuration files is my suggestion. – gertvdijk Dec 12 '12 at 12:21
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