What is SMTP (Simple Mail Transfer Protocol)?

Detailed Explanation

SMTP is the foundation of email transmission. When you send an email, your email client uses SMTP to communicate with your mail server, which in turn uses SMTP to communicate with the recipient's mail server. In the context of email verification, tools like ZeroBounce AI "ping" the recipient's SMTP server, initiating a conversation to ask if heavily the mailbox exists, without actually sending an email.