Which protocol is commonly used for delivering emails?

SMTP, or Simple Mail Transfer Protocol, is widely recognized as the standard protocol for sending emails over the Internet. It operates on a client-server basis, where the email client (the sender) communicates with an email server to facilitate the transmission of messages. As emails are typically sent from one server to another until they reach the recipient’s server, SMTP is well-suited for this task.

In addition to sending emails, SMTP can also communicate with email clients, allowing users to send messages seamlessly. While other protocols are involved in the process of email delivery, such as POP3 and IMAP for retrieving emails, SMTP remains the primary protocol dedicated to the sending and forwarding of email messages.

The other options provided serve different purposes: HTTP is primarily used for transferring web pages, FTP is used for file transfers, and SNMP is designed for network management and monitoring. Thus, SMTP is the clearly appropriate choice for delivering emails.