How does SPF work?
The key technical detail with SPF is that it works by looking at the domain of the Return-Path value included in the email’s headers.
The receiving server extracts the domain’s SPF record, and then checks if the source email server IP is approved to send emails for that domain.
What does SPF record do?
A Sender Policy Framework (SPF) record is a type of Domain Name System (DNS) record that can help to prevent email address forgery. Adding an SPF record can help prevent others from spoofing your domain. You can specify which mail servers are permitted to send email on behalf of your domain.
Will SPF record prevent spoofing?
A carefully tailored SPF record will reduce the likelihood of your domain name getting fraudulently spoofed and keep your messages from getting flagged as spam before they reach your recipients. Sender Policy Framework (SPF) is an email validation system designed to prevent spam by detecting email spoofing.
How many SPF records can I have?
Per the RFC, SPF records have a 255-character limit for a single string. This is an inherent limit of DNS TXT records.
How do I read an SPF record?
You can manually check the Sender Policy Framework (SPF) record for a domain by using nslookup as follows:
- Open Command prompt (Start > Run > cmd)
- Type “nslookup -type=txt” a space, and then the domain/host name.
- If an SPF record exists, the result would be similar to: