SMTP is responsible for transmitting outgoing e-mail messages from the sender's server to the recipient's server. It performs several key functions:
- Establishes a connection between the sender's mail server and the recipient's mail server.
- Transfers the e-mail message content, including text and attachments.
- Communicates with the recipient's server to ensure successful delivery.
- Manages error notifications and responses, informing the sender of any delivery issues.
- Ensures reliable and secure transmission of e-mails over the Internet.