Chrome extension
Check an address without leaving the page
Right-click any email address on any site and Mail7 runs the same check as this website: syntax, mail servers, mailbox. The answer is Valid, Not Valid or Unknown, never a guess.
Free, no registration. Chrome, Edge, Opera and Brave.
Found on this page
5 addresses · 2 valid · 1 not valid · 2 unknown
| Address | Verdict |
|---|---|
| [email protected] | Valid |
| [email protected] | Valid |
| [email protected] | Unknown |
| [email protected] | Not Valid |
How it works
Three steps, no tab switching
-
Step 1
Right-click an address
Any email address on any page: an inbox, a profile, a contact page.
-
Step 2
Choose Validate with Mail7
The entry sits in the browser's own context menu, next to Copy.
-
Step 3
Read the verdict
Valid, Not Valid or Unknown, with the reason and the option to export.
Try it here
Addresses to right-click
With the extension installed, right-click any of these. The first group is well formed, so the answer depends on the mail server. The second group cannot be delivered to at all.
Well formed
Broken by shape
- invalid-email
- [email protected]
- @example.com
These fail on syntax alone, before any mail server is contacted.
What it does
Features
- Right-click validation in the context menu
- Works on any website
- Results in a couple of seconds
- MX records and a real SMTP mailbox check
- Export the addresses found to CSV
- Free, with no registration
Browsers
Where it runs
Every Chromium-based browser. Firefox and Safari use different extension stores and are not supported.
- Chrome
- Supported
- Edge
- Supported
- Opera
- Supported
- Brave
- Supported
Questions
Frequently asked questions
Is the extension free to use?
Yes, the extension is completely free and uses the same validation engine as our website.
Does it work on all websites?
The extension works on most websites. It automatically detects email fields and adds validation functionality.
Is my data secure?
Yes, we use encrypted connections and don't store any personal data. Email validation is done in real-time.
How do I uninstall the extension?
Go to chrome://extensions/, find Mail7.net Extension, and click "Remove".
Add it once, use it everywhere
Free forever, no registration, and the same three honest answers you get here.