Company email hosted by Google Apps. Company PBX in-house is Elastix. All voicemails received on the extensions of Elastix are supposed to be emailed by the CentOS server (Postfix) to the email address of the employee.
Using relayhost on postfix, I am sending those emails through Google Apps (smtp.gmail.com), but some of these voicemail emails end up in the spam. Sending it through Google, and sending it to an email hosted by Google - yet there's spam. Email sent from the Google Apps interface - no complaints of it going to spam - just from the Elastix server.
I've just asked our DNS domain guys to add spf records, but is that all that's needed? Some help please!