Email address checks

This server checks whether email addresses exist, for the contact lists that customers of SmartFlowPros import before they send. It asks the address's mail server whether the mailbox is there, then hangs up: no email is ever sent from here, and nothing is delivered to anyone. Checks run only when a customer imports a list, at most 10 connections per mail server per hour, and a server that asks us to wait or refuses us is left alone for at least half an hour before we try it again. To report a problem or ask us to stop checking your domain, write to support@smartflowpros.com.