When verifying an email, we use a multi-step process designed to assess accuracy and deliverability without sending any actual emails. This includes both pre-validation and physical verification steps.
What is a valid email address? A valid email address can receive emails. For instance, if someone subscribes to your newsletter with their work email, it's valid while they work there. But if they leave the company, the email might become inactive and invalid.
How does email verification work? When verifying an email, there are a number of methods that we use. Some are performed as a precursor to any physical checking - we call this "pre-validation".
At a high level, and without giving away any of our trade secrets, we pre-validate by:
Verifying a correct syntax of the email address Checking the domain name exists and has valid mail delivery DNS records Querying if the domain is configured as "accept all" - does it accept any email address Determining deliverability based on previous results Once this process has completed we may also then perform a physical verification.
We do this using a number of methods, but primarily we communicate with the target mail server of the domain to see if it accepts mail for the email address being verified.
We don't actually send any mail during this process.
There are some additional processes and checks that we perform under the covers that are all related to data integrity and ensuring that we are able to deliver the best quality of results as possible.
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