The engine that onboards a paying domain, pointed at anyone's.
Free SPF, DMARC, MX, blacklist and header tools, powered by the same verification engine that onboards a paying domain. No signup, no modal, no email gate.
SPF checker
Read a domain's SPF record, count its DNS lookups against the limit of ten, catch the two-record permerror, and get a merged record you can publish.
Open the tool →DMARC checker
Read a domain's DMARC policy, see which rung of the ladder it is on, and get the record to publish next.
Open the tool →MX lookup
See which servers receive mail for a domain, in priority order, and which provider is behind them.
Open the tool →Blacklist check
Check a domain or IP against Spamhaus SBL, XBL, PBL and DBL, Barracuda, SpamCop, SORBS and Invaluement.
Open the tool →Header analyser
Paste raw headers and get the delivery path in order, the delay at each hop, and the SPF, DKIM and DMARC results.
Open the tool →Why these are free
The verification engine and the compiler behind these tools already exist because the product needs them. Exposing them publicly costs us nothing beyond what we already built, and it puts us in front of people at the exact moment they are choosing an email platform.
Every page answers in under 300 ms, works without an account, and ends with one contextual link — never a modal.