Sender Policy Framework (SPF) is an email validation system designed to identify spam. An SPF record is a type of Domain Name Service (DNS) record that identifies which email servers are permitted to send email on behalf of your domain.


Our emails are sent via SendGrid. There are detailed instructions for setting up an SPF record with it here: https://sendgrid.com/docs/Glossary/spf.html, to ensure your email invitations don't end up in a recipients spam folder.