Free tool
Check whether anyone can send email as your domain.
Whether other mail systems trust your email comes down to the authentication records your domain publishes. Most businesses have never looked at what is published under their name, or at what is missing. Enter your domain below. The lookup takes seconds.
The lookups happen in your browser over DNS-over-HTTPS. The domain you enter is never sent to us.
01 — Keep impostors off your name
With the domain configured correctly, senders you have not authorized cannot use your email address. That shields your brand’s reputation from phishing and spam attacks.
02 — Reach the inbox
Correct records help your messages land in customers’ inboxes and stay out of their spam folders. Email marketing and everyday correspondence both depend on it.
03 — Show you are legitimate
Authenticated mail tells customers, partners, and email providers that the sender is genuine and can be trusted.
What the scan looks at
SPF is the published list of servers permitted to send mail for your domain. If it is missing, anybody can send as you, and spam filters trust your real mail a little less without telling you.
DKIM puts a cryptographic signature on your mail, which lets the receiving server confirm nothing was changed along the way. It relies on a selector that only you know, so our scan tries the common ones.
DMARC instructs receiving servers on how to treat mail that fails the check, and it sends you reports showing who is sending under your domain. If it is absent, forged invoices and offer letters get delivered without challenge.
A clean scan is a start. It confirms the domain itself is locked down, which leaves the remaining risk in mailboxes, devices, and habits.
What to do with the result
Everything passed? Good. Apply the same scrutiny to mailbox rules, MFA, and the logins that should have been removed by now. The risk assessment covers those.
Problems found? For someone who does this every week, most are a 30-minute fix. We publish the records and monitor them, so they do not quietly expire.
You built the business. We help keep it standing as it grows.
Sorting out technology is not something you have to do by yourself, and the future of the company should not rest on luck. Defendrs works alongside you as a dedicated partner: we automate your systems, protect your data, and guard your profits 24 hours a day, 365 days a year.