How it works
Syntax -a simple check to ensure the email address conforms to common standards.
Domain -a lookup on the domain element of the email address to ensure it is configured to accept emails.
SMTP check -the really clever bit, where we check that the user mailbox exists. By checking with a would-be recipient's email server via SMTP, we can often see whether a user for a given email address actually exists:
It's important to note that this approach does not actually send an email to a recipient. The verification process stops as soon as the email server returns information as to whether or not the given user exists. Additionally, SMTP verification can determine if the recipient's domain even exists, if there's a mail server associated with the domain, and much more.
The Proofy team has been in the email security and privacy industry for 2 years, and have built a reputable email backbone across multiple data centers that processes millions of messages each day. It's this backbone that enables us to achieve a level of performance and accuracy that sets us apart.