SPF is a Simple Mail Transfer Protocol (SMTP) validation system that verifies the IP address of an email sender. It lets administrators determine which servers can send email messages from a particular domain.
Important
As of 2018.1, SPF alignment with your DMARC policy record is no longer required when you send email from NetSuite. An administrator or your local IT Department must set up an SPF record only when it is specifically required by a recipient’s email system. This can be confirmed between the recipient's IT and the sender's IT department.
An SPF record is a TXT record using the SPF format with your DNS provider. An SMTP server on the receiving end determines (based on the content of the DNS TXT record) whether the IP address the email message is sent from is approved for that domain. A DNS TXT record for SPF might be required by the email infrastructure or services (as presented by email domains) that you send email to.
If you must include NetSuite systems in your SPF DNS record, ensure that the definition ‘include: sent-via.netsuite.com’ is a part of that record.