Check MX, SPF, DKIM, DMARC and 4 blocklists
Paste a mail domain to read its MX, SPF, DKIM and DMARC records and check up to 8 sending addresses against 4 blocklists. It runs once with a 10 second cap, the same runner a monitor uses; the result says where it ran.
How to read this
- MX
- The mail exchangers for the domain, in priority order.
- SPF
- Whether a single valid SPF record exists and how many DNS lookups it costs.
- DKIM
- Whether each selector you named has a key published, or is revoked.
- DMARC
- Whether a policy is published, and whether it is none, quarantine or reject.
- Blocklists
- Up to 8 sending addresses, the MX hosts' IPv4 addresses, checked against Spamhaus ZEN, SpamCop, PSBL, UCEPROTECT.
Questions
Is this a scan?
No. It reads the domain's records once and checks up to 8 sending addresses against 4 blocklists.
Why did the check say couldn't check?
A blocklist that did not answer is left out of the result entirely, never reported as clean or listed.
Related
Read
SPF, DKIM and DMARC explained: how to read the records and the mistakes that get mail rejectedRead SPF, DKIM and DMARC records term by term, look them up with dig, and fix the mistakes that get legitimate mail rejected.How to check a mail server against blocklists (and why "not checkable" is not "clear")The four DNS blocklists that get mail refused, the dig command that checks an address, how to get delisted, and why an unanswered lookup is no pass.
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