Free web tools
Email tools.
Check SPF, DKIM, DMARC and whether a domain or IP appears on common blocklists.
Choose your next check.
Find the tool that matches your task.
SPF Checker
Inspect your SPF record, policy and DNS lookup dependencies.
Open toolDKIM Checker
Inspect a published DKIM public key and its DNS configuration.
Open toolDMARC Checker
Inspect your domain’s DMARC record, policy and reporting settings.
Open toolEmail Reputation Check
Inspect a sending IP’s blocklist status and your domain’s email configuration.
Open toolWhich tool do you need?
Find a tool based on what you want to do.
Learn the basics
Understand email authentication.
These checks read DNS records receivers use to decide whether a message matches the domain it claims.
Browse all toolsWhat these checks read
SPF lists hosts allowed to send for a domain. DKIM publishes a public key so a receiver can verify a signature. DMARC tells receivers how to treat mail that fails those checks. Email Reputation also looks at blocklists and reverse DNS when you provide a domain or IP.
How SPF, DKIM and DMARC fit together
Start with SPF for the sending hosts, then DKIM for the selector you publish, then DMARC for the policy. Email Reputation can review those records together with blocklist and reverse DNS data.
What is email authentication?
It is the DNS and signature data receivers use to check that a message matches the domain it claims. SPF, DKIM and DMARC are the records these tools read. They do not send a test message.
Why might mail be filtered?
Missing SPF, DKIM or DMARC, a blocklist listing, or a PTR that does not match the hostname are common causes these tools can show. Content and engagement are outside these checks.
What is an email blocklist?
A DNS blocklist publishes addresses or domains reported for abuse. Receivers may filter mail from a listed address. Email Reputation looks up the lists this tool queries. Removal is done with the list operator, not here.
How does reverse DNS relate to mail?
A PTR record maps the sending IP to a hostname. Forward-confirmed reverse DNS means that hostname resolves back to the same IP. Email Reputation includes that check when you supply an IP.
Need help with an email record?
Talk to our team about an SPF, DKIM, DMARC or reputation result. That is not a managed email service.