XF 1.3 Emails being considered spam!

Hello, I am currently using OVH for my VPS hosting. Everytime I use email for registration it's counted as spam in the receivers email. Any ideas on why? I am using Google SMTP, I've tired ManDrill too.
 
OVH's network is a haven for spammers, quite a fair bulk of their IP allocation is listed in various blacklists.

What were the results when you used Mandrill? If you were still having issues, you need to make sure that you have valid SPF/DKIM records.
 
Other than the steps listed in that resource, not really.

You are at the mercy of other servers/third parties when it comes to emails being flagged as spam.
 
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