Q&A ▸ Bad e-mail addresses are sometimes marked as valid

[Maxprog Knowledge Base]

For some addresses, such as AOL, Yahoo, and other non-SMTP mail, you can't verify whether the address is good or not. You won't know definitively until some bounce. The mail server won't cooperate and as a result addresses will be marked as valid. In fact, a few ISP's mail servers are configured in a way they prevent anybody to find out if an e-mail address is good or not sometimes to protect their customer e-mail addresses from harvester tools. You can get more information about this here: Bad e-mail addresses are sometimes marked as valid.

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