Email list hygiene for all of us.

AlfredKnows is an all-in-one threat detection and email validation service trusted by the world’s most respected brands.

Email List Cleaner


Over 9 billion emails checked.

Customer Since 2012
Customer Since 2014
Customer Since 2019
Customer Since 2020


Know what’s bad, risky or good—at a glance.

Malicious contacts, bots, zombies, bogus and invalid addresses.

​Disposable, role-based, catch-all, seed addresses, and more.

Valid and confirmed addresses with no known threats.
You’ll get all the nitty-gritty details too, learn more.


Email hygiene done right.

Eliminate bad addresses and identify valid contacts.

Threat Removal

Removes bots, seeds, zombies, malicious contacts, and more.

Contact Validation

Performs multiple checks to ensure that your contact’s identity is valid.  

Deliverability Detection

Returns “Plain English” insights into the mailability of your contacts.



Lower your risk, and your blood pressure.

Amazingly Fast
Complete list hygiene in minutes.

Friendly Support
Experts available by phone, email, or chat.

Completely Compliant
Built to be GDPR compliant from the get-go. 


       A world-class email list hygiene service from tried-and-true email geeks.
Andrew Bonar
Founder, emailexpert
       AlfredKnows is the winner…it outperforms in price, performance, and useability.
Kumar Doultani
Senior Manager, InboxArmy



Resources to give you the inside track.

Looking to get ahead? We have expert guidance, timely resources, and helpful documentation. Learn More


See how it all comes together!

No matter if you’re new to email list hygiene or have a well-established process, you’ll love AlfredKnows.

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