Email Authentication Tools - SPF, DKIM, DMARC Generator
Published February 27, 2025 · Updated July 17, 2026 · Email Security
Getting SPF, DKIM, and DMARC right by hand is fiddly — one typo in a DNS record and your mail lands in spam. That is exactly what email authentication tools are for: generators build the records correctly, and checkers confirm they are live and passing. Here is how to use them to lock down your domain in minutes.
The three tools you'll actually use
- SPF generator: enter your senders and it outputs a correctly formatted
v=spf1 … ~allrecord — with only one SPF entry, as required. - DKIM generator: creates the key pair and the exact TXT record to publish at your selector.
- DMARC generator: builds the
_dmarcrecord with the policy and reporting address you choose.
Then verify before you rely on it
Generating is only half the job. Use an authentication checker to confirm each record resolves and passes. A record that looks right but has a stray space or wrong selector will silently fail — and a checker catches it before your customers do.
Authentication generated AND configured for you
A dedicated SMTP server produces your SPF, DKIM and DMARC records and sets them up correctly — no copy-paste, no typos, no spam folder. From $39.99/mo.
Frequently asked questions
What is an SPF/DKIM/DMARC generator?
A tool that builds correctly formatted authentication DNS records from your inputs, so you can publish them without syntax errors.
How do I check if my records are working?
Use an authentication checker or send a test to a validation service — it reports whether SPF, DKIM, and DMARC each pass for your domain.
Do I still need these tools with a managed SMTP?
Not usually — a managed dedicated SMTP generates and configures the records for you, and you can still use a checker to confirm everything passes.