Google SMTP acceptance policy?

[Jonathan Traylor <jtraylor () networkinglinux net>]

Anyone have guidance on how to legimately stay out of Google/GMail's spam
classifier and arrive at the inbox? 

We have a domain that is relatively newly registered, has proper MTA
configuration and SPF records that I haven't been able to find on any
blocklist, but GMail sends email from it straight to the spam folder.

I haven't been able to find useful documentation for GMail in this regard
around the web. Have looked at abuse.net's info, links and resources.

Thanks,

--
Jonathan