To check if an email has passed an SPF (Sender Policy Framework) check, you need to follow these steps:
Step 1: Retrieve the Sender’s SPF Record
You can retrieve the sender’s SPF record by looking up the Sender Policy Framework (SPF) record in DNS. The DNS record will list all authorized mail servers that are allowed to send email on behalf of that domain.
Step 2: Get The IP Of The Email Server
You can get the IP address of the email server that sent the email.
Step 3: Compare IPs In SPF Record With Email Server IP
Compare the IP address of the email server with the IPs listed in the Sender’s SPF record. If the IP is found in the SPF record, then the email has passed SPF check. If the IP is not listed in the SPF record, then the email has failed SPF check.
Step 4: Determine SPF Policy
If the email passes the SPF check, it will be received by the email server. If the email fails the SPF check, the email server may reject or quarantine the message depending on its SPF policy.
In short, SPF is a simple email validation system that uses DNS records to indicate which email servers are authorized to send emails on behalf of a given domain name. It helps prevent email phishing and spoofing by allowing the receiving email server to check if the email comes from an authorized source, and reject them if they do not.
