Suped
Product
Tools
Resources
MSP
Pricing
Company
Log in
Get started
Knowledge base
/
Email authentication
SPF
A comprehensive collection of questions and answers about SPF email authentication from email marketers, experts and technical documentation.
What is the maximum number of DNS lookups allowed in an SPF record?
What does a '~all' mechanism in SPF signify?
What SPF mechanism allows for IP addresses?
What DNS record type is used for SPF?
Does the 'all' mechanism in SPF always mean a hard fail?
What SPF qualifier denotes a hard fail?
Can an SPF record contain multiple 'v=spf1' declarations?
Does SPF authenticate the 'From' header directly?
What is the purpose of the 'ptr' SPF mechanism?
Does SPF apply to the 'Return-Path' address?
Next
Start monitoring your DMARC reports today
What you'll get with Suped
Real-time DMARC report monitoring and analysis
Automated alerts for authentication failures
Clear recommendations to improve email deliverability
Protection against phishing and domain spoofing
Get started - free
Product
DMARC monitoring
SPF flattening
Blocklist monitoring
MSP
Pricing
Tools
DMARC record generator
Blocklist checker
Email tester
Resources
API docs
Customers
Blog
Guides
Knowledge base
Company
About
Trust and security
Suped
Privacy policy
Terms of service
© 2025 Suped Pty Ltd
Privacy policy
Terms of service