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dnsbl.info reports that 69.43.165.11, MX for mail.rsync.net, is blacklisted by ips.backscatterer.org:

I suggest fixing your SMTP server configuration [1][2] and maybe listing your IP on dnswl.org. (edit: I see you did the latter.)

That's the rsync.net mailserver and that's interesting, thank you.

However I was speaking of my own, personal mailserver, which is not listed.

Also - do we really think "big email" (like google) are using either of these (blacklist or whitelist) services ?

I can't tell you what goes on behind the scenes at Google, but I have resolved email issues to gmail by getting removed from blacklists.