How to correctly manage multiple virtual hosts with postfix?

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http://serverfault.com – I'm tring to correctly setup a postfix server for our products for a couple of days. The server is running correctly but some emails sended to gmail are delivered to spam box. The server is configured like this: /etc/postfix/main.cf mydomain = example.com myhostname = example.com mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain, example.com, example.org, example.net virtual_alias_domains = example.org, example.net virtual_alias_maps = hash:/etc/postfix/virtual /etc/postfix/master.cf 587 inet n - n - - smtpd -v smtp inet n (HowTos)