Free tools
Small things we needed while building email infrastructure, free and without an account.
Disposable inbox
A throwaway address that receives mail for 15 minutes, then deletes itself. For testing your own signup and password reset flows without filling a real inbox with them.
DMARC record generator
The SPF, DKIM, and DMARC records a sending domain needs, with a policy you can actually support on day one.
Mail tester
Send a real message to a generated address and see whether it authenticated, what would hold it back, and the full headers.
DMARC report parser
Drop an aggregate report and read it: who is sending as your domain, how much authenticates, and which sources are failing.
SPF lookup checker
Count the DNS lookups an SPF record costs, including every nested include, and see which branch pushed it over ten.
SPF, DKIM, and DMARC checker
Check what a domain publishes for SPF, DKIM, and DMARC, whether it is blocklisted, and what is wrong with any of it.
Email header analyzer
Paste an Authentication-Results header and see what passed, including the alignment check that decides DMARC.
Email warmup calculator
Turn a target sending volume into a week by week ramp for a new domain, with the reply share the doubling rate depends on.
Send your first email in one call.
One POST to /v1/emails, an SDK in the language you are already writing, and domain verification that finishes in one screen.
3,000 emails a month, free, no credit card.