SPF stands for Sender Policy Framework. It is an email authentication protocol designed to detect email spoofing and prevent unauthorized senders from sending mail on behalf of a specific domain.
SPF email records help maintain a list of verified germany phone number list for your domain name that can be publicly queried and retrieved by receiving servers to authenticate emails, as per RFC 7208.
How SPF works
SPF works by allowing domain owners to publish a list of authorized email servers (IP addresses or hostnames) that are allowed to send email on their behalf. Here is a step-by-step guide to how SPF works:
1. Publish your records for SPF
The domain owner publishes an SPF record in the DNS for their domain. This record specifies which email servers are authorized to send email to that domain.
2. Receive your email
When an email is sent, it contains the sender's domain name information.
3. Extract the sender’s domain name
The recipient's email server extracts the domain name from the sender's email address.
4. Perform a DNS query
The recipient's email server performs a DNS query to retrieve the SPF record for the sender's domain name.
5. Conduct SPF certification
An SPF record contains a policy that defines which servers are allowed to send email for that domain name. The recipient's email server compares the IP address or host name of the server that sent the email to the list of authorized servers specified in the SPF record.
6. The final certification result is determined
Based on the SPF check, the recipient's email server determines whether the message came from an authorized server.
7. Actions taken based on results
The recipient's email server takes action based on the results of the SPF check. It can accept the message or even mark it as spam.
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