I have followed numerous guides on this help forum (A great resource btw) on setting up outgoing mail on my VPS/Worpdress installation.
To sum up the problem, I have installed Postfix, added an SPF record, and ensured my PTR record is there, yet all messages sent from the server are still marked as 'spam' by Google.
The original header from Gmail can be found here (some information removed for privacy): http://pastebin.com/xJxrB9hB
I have run out of ideas at this point, as I have seemingly exhausted the guides available to me... I'm wondering if I screwed something up somewhere, and if a pro out there can spot my mistake.
Thanks in advance,
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