Is possible to get blacklisted or blocked using EMV?

[nectarine]

"Furthermore you connect to many SMTP server, not the same one all the time."
What if I want to verify many variations of a persons email and send it through EmailVerifier? ex. [email protected], [email protected], [email protected], etc..etc..?
Will this get black listed? Can I space out the verifications to the same SMTP server? How can I do this safely?

 

[stanbusk]

All would be blacklisted in fact but eMail Verifier should detect that situation. We already have placed a lot of filters to find out when you are blacklisted on a server. Spacing tests would not have any effect.