[mothered]

How can I sure an email exist or not exist without send any email to that address?

Simply try creating/registering an account (with the respective email provider) using the email address In question.

Email addresses cannot be duplicated, so during the registration process, It will tell you whether It's available or taken.

Thank you, but I meant wasn't the emails like Gmail, Yahoo or...I meant was the email from a company website.

Okay, I thought you were referring to a personal email address.

I've read your other thread with theHarvester, and replied accordingly.