SPF (Sender Policy Framework) is an anti-spoofing technology that tells receivers which servers are allowed to send mail on behalf of your "Mail From" domain (also known as; envelope address, bounce address, return path, RFC5321). The "Mail From" domain used when sending through our system is "informz.net" which is complete with SPF authentication. This means no configuration is necessary on your part.
However, you may find that some receivers are still checking something called "Sender ID" (this is obsolete, but some older systems still check). This is when the receiver looks up the SPF record on your visual "from" address.
If you have an existing SPF record on your sending domain, you may want to consider adding our servers to it to ensure delivery across all mail platforms. This can be done by adding "include:informz.net" or by adding the sending IPs associated with your account. These IPs can be found in Admin > System Settings > Scroll to the bottom of the page.
For more information on SPF verses Sender ID, click here.