RS Email Verifier is a software program that verifies email addresses from a mailing list and identifies if they are valid or not. It is user-friendly and reliable, helping bulk mail campaigners to identify and remove invalid email addresses. RS Email Verifier uses a four-level verification process that is similar to how ISP mail systems work. The first level is checking for email syntax, followed by verifying the availability of the email domain, then checking if the mailbox exists and finally verifying the mail server.
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