SPF

This article will describe how to add a SPF record. This will allow us (Sendgrid) to send mail from your domain name.
The SPF-record exists of a single entry in the DNS of the customer.

The SPF-record that needs to be added:

include:_spf.supportbyrobin.com

Checking SPF

To assure this has been set up correctly, follow the steps below:

• Navigate to: https://mxtoolbox.com/
• Enter "SPF:domain.com" in the text box (replace domain.com with the domain SPF is being checked for)
  
• Hit enter
• On the results page, check if "include:_spf.supportbyrobin.com" is present and no errors are being displayed
  

Common mistakes in SPF:

One error we see often is "Too many lookups":

A lookup is when the SPF record refers to a different domain, meaning _spf.supportbyrobin.com counts as 1. However if a domain used in the record in turn refers to other domains, these will be added to the total. For the given example mimecast adds 5 lookups, this can be checked by clicking the SPF entry:

The easiest solution to this error, would be to take the IP's from these lookups and have the customer enter these in their own SPF record as IP's instead of through the mimecast lookup. This phenomenon is known as 'SPF flattening'.