Why are emails sent by my server marked as SPAM?

Question

My website, all written in PHP, has an automatic system to notify users via email. Everything worked perfectly until i moved everything on a new less expensive dedicated ser

Answer 1

Check this line in the header:

Received-SPF: none (google.com: noreply@racebooking.net does not designate permitted sender hosts) client-ip=2001:41d0:1:ef28::1;
Authentication-Results: mx.google.com;
       spf=none (google.com: noreply@racebooking.net does not designate permitted sender hosts) smtp.mail=noreply@racebooking.net

I think you have not correctly configured the SPF entries in your DNS.

See this Google Products thread about this: https://productforums.google.com/forum/#!topic/apps/nvGcYDjONfc

I can see that you have no SPF entries defined for "racebooking.net":

$ dig +short racebooking.net txt
"1|www.racebooking.net"

You need to define an SPF entry like:

"v=spf1 mx a:mail0.racebooking.net -all"

You also need to include any other host from which you might be sending email (ie web applications sending email from @racebooking.net).

More info about what SPF is: http://en.wikipedia.org/wiki/Sender_Policy_Framework