Free deliverability tools · Coming soon
Free deliverability tools
We built these to onboard sending domains. They work just as well on somebody else's. No account, no rate limit, and no email capture — the point is that they are genuinely useful, not that they collect you.
Coming soon: Our free deliverability and DNS verification engine is currently in active development. You can preview the diagnostic checks and evaluation criteria for each tool below.
- SPF checkerComing soonCheck an SPF record, resolve every include, and count DNS lookups against the limit of ten.
- DKIM validatorComing soonFetch a DKIM public key by selector, check the key length, and verify the record parses.
- DMARC checkerComing soonParse a DMARC record and explain what it actually does to mail that fails authentication.
- MX lookupComing soonResolve a domain's mail exchangers, check priorities, and flag common misconfigurations.
- Blocklist checkComing soonQuery major blocklists for an IP address or sending domain.
- Inbox placement testComing soonSend one message to seed addresses across major providers and see where it actually lands.