Is This Email Address a Scam? Here's How to Check for Free
Scam emails are everywhere, and the sender's address is often the first thing that tips you off that something isn't right. Maybe the domain looks slightly off. Maybe you've never heard of the company. Maybe a "business inquiry" just landed in your inbox from someone you've never dealt with and something feels wrong about it.
We built a free tool for exactly that moment: mailpi.app/scam-check. Paste in the sender's email address and get an instant read on whether the domain behind it looks legitimate — no account, no signup, no cost.
What the Checker Actually Looks At
The tool focuses on the domain — the part after the @ symbol. That's where the most useful technical signals live. Here's what gets checked:
Domain age
When was this domain first registered? A domain that's a few weeks old sending you a "business proposal" or "urgent invoice" is one of the clearest red flags in email scams. Real companies have domains with years of history. Scammers register cheap lookalike domains right before they run a scheme, and that's something they genuinely cannot hide.
Known malicious domain lists
The domain is cross-referenced against databases of addresses that have already been flagged for phishing, spam, or fraud. If it shows up on those lists, you'll see it immediately.
Email authentication records (SPF, DMARC, DKIM)
These are technical DNS records that show whether a domain is properly configured to send legitimate email. Established businesses almost always have these set up correctly. Someone who registered a fake domain last week to impersonate a real company usually doesn't.
When Should You Use It
Any time you have a sender's address and something feels slightly off, it's worth a five-second check. Some situations where it's particularly useful:
- A contact form submission from someone claiming to represent a company you've heard of
- An unexpected email asking you to verify your account, confirm a payment, or take urgent action
- A new business inquiry from an address you've never seen before
- Any domain that looks almost right but isn't quite —
amazon-help.cominstead ofamazon.com, for example - Before responding to a marketplace buyer or seller for the first time
The Email Address Is Just the Starting Point
A clean domain check is a good sign, but it doesn't tell the whole story. Scammers sometimes use aged domains, and occasionally a legitimate-looking address is behind a well-crafted phishing attempt. The domain check is a fast first filter — not the final word.
If the domain looks fine but the email itself still feels wrong, that's where the full Mail P.I. analysis comes in. Forward the email to check@mailpi.app and you'll get a deeper read — a 0-100 risk score based on the actual content, the writing patterns, the links, the urgency tactics, and everything else that a domain check alone can't see.
A few things worth looking at alongside any domain check:
- Is the email creating urgency or pressure to act quickly?
- Are they asking for payment, credentials, or sensitive information?
- Does the sender's story actually make sense?
- Do the links in the email go where they claim to go?
- Is the real company's name being used but from a domain you don't recognize?
Why We Made It Free
Most tools that do this kind of check are buried behind paywalls or require you to create an account before you see anything useful. We wanted something anyone could use in the moment they needed it — no friction, no signup, just paste and check.
It's also a natural complement to the main Mail P.I. tool. Sometimes you want a quick domain check before you've even decided whether to open the full email. Sometimes you just have an address and nothing else. The scam checker handles that first step, and forwarding to check@mailpi.app handles everything after.
Try it at mailpi.app/scam-check. If you've got an address that's been bugging you, you'll have an answer in about five seconds.