google apps does not work for automated outgoing emails.
after sending a dozen or so in a day, that have the same format, google will start sending you bounces saying how they prevent spam, both on the sending end, and receiving end. at least that was the case when i tried it for a project about 6-8 months ago.
may be different if you pay up the $50 / account for google apps enterprise.
the best combo is, google apps for the receiving (pop3/imap), own server for the sending.
cant beat it.
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