Which of your client domains are quietly failing email?
You manage email for a lot of client domains, and any one of them can be misconfigured, spoofable, or quietly landing in spam. Doptar™ Deliverability Doctor reads a domain's public DNS and explains its SPF, DKIM, DMARC and MX in plain language — with a 0–100 score and the fixes that matter most.
Public DNS only. No login, no connection, no messages sent, nothing changed, no personal data.
Managing more than one client?
Paste your whole client list and get one ranked table — the worst-configured domains first — so you know where to start. Up to 25 domains at once, public DNS only.
Check domains in bulk →More than a DNS lookup
A raw DNS lookup shows you records. Deliverability Doctor scores the domain, explains each risk the way you'd explain it to a client, and puts the three highest-impact fixes first — written for agency owners, not DNS engineers.
What it checks
It works for any sending domain — your CRM email setup, an email platform, or a plain mailbox.
- SPF — which servers may send for the domain, plus the 10-lookup limit that silently breaks SPF when exceeded.
- DKIM — whether a signing key is published for the selector you provide.
- DMARC — whether spoofing is monitored or blocked, and how strictly.
- MX — whether mail servers are configured for the domain at all.
See it in action
Browse example reports for a healthy domain, one with gaps, and one exposed to spoofing — no domain of your own required.
View sample reports