Provider identity, without the guesswork
Paste any sending domain and we'll resolve its MX records over DNS, sort the priority ladder, and identify the hosted provider behind each resolved host. You'll get a plain-English readout for recognized ESPs, unknown or self-hosted servers, and mixed provider sets — plus the score and findings that explain the inbound risk.
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Read the DNS mechanics
The MX record setup guide explains how receivers use lower numeric priorities first, how to add a real fallback MX, why TTL matters during a provider migration, and how to verify the result with dig MX. Use it to turn this lookup into a clean, resilient inbound path.
Continue the audit
Once you know where inbound mail lands, work through SPF, DKIM, DMARC, blocklists, and bounce signals in the full deliverability audit. Use the blacklist lookup checker for the adjacent domain or IP blocklist status check, then let the guide keep every check in order and give you a fix list instead of another isolated score.
Run the 10-step audit →