Server emails are considered as SPAM only by Gmail

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http://serverfault.com – I'm developping a service which lets users send our content via email to their friends. The problem is that those emails often ended up as Spam. So I went through all the stuff to make my server send nice emails with correct headers (SPF, DKIM, rDNS, etc...). Now the emails have clean headers, and are being received fine by hotmail or yahoo, but are still being marked as spam in Gmail ! I am going completely crazy over this, since I can't figure out what I am doing wrong. The welcome message when a user subscribes has almost the same template, and yet is not considered as Spam... Here is a s (HowTos)