Blacklist Verification: Blacklisting emails is a common and efficient way for email service providers to reduce spam. If the syntax is not correct, then there is no need to perform other checks to determine whether an email is valid or not.ĥ. Simply check the syntax of an email and see if it’s okay or not. Syntax Validation: A simple feature that every bulk email verifier software should have. Catch-All emails can result in email bounces and can affect your deliverability.Ĥ. Catch-All Verification: A catch-all mail server accepts all emails whether a mailbox for that email account exists or not. Duplicate removing: The email verification service should be able to remove duplicates from your email list before performing the validation process.ģ. While some email services can accurately detect disabled Yahoo, Outlook, and AOL emails, others have less accuracy.Ģ. Accuracy: How accurate is the algorithm of a particular bulk email verification service. To help you understand which one you should pick, you should look for these factors.ġ. While most bulk email verification platforms in this list can clean from a small to extensive email list on the fly, choosing your business’s best option can be pretty tricky. What should you look into a proper bulk email verification service? 22 Best Free Bulk Email Verification Tools.What should you look into a proper bulk email verification service?.