Check MX, SPF, DKIM, DMARC and four 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 from US East with a 10 second cap, the same runner a monitor uses.
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 rejectedWhat SPF, DKIM and DMARC each do, how to read a record term by term, the dig commands, and the mistakes that get legitimate mail rejected.How to check a mail server against blocklists (and why "not checkable" is not "clear")What a DNS blocklist is, the four lists that get mail refused, how a listing happens, the dig command to check one, delisting, and why silence is not a pass.
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