Setup a SPF record
What is SPF
SPF (Sender Policy Framework) is a way to restrict which mail servers are allowed to send email for your domain name.
An example of an SPF would be :
example.com. TXT "v=spf1 -all"
SPF records are TXT records placed into a domain's DNS settings. To setup a SPF record we recommend using the following link.
Be advised that forwarding emails can sometimes break the SPF. If this is the case we recommend using SRS (Sender Rewriting Scheme). More information about this can be found here.
SPF details for our Hosted Cloud can be found here, for Local Cloud we recommend to use an "include" as that's easiest to modify in the future when required.