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For each of the mentioned activities related to email, different protocols are used to facilitate the communication between email clients (applications or web-based interfaces) and mail servers. Here’s how these protocols apply to each activity:
1. Send an email from a mail client to mail server (m1): The protocol commonly used for this activity is Simple Mail Transfer Protocol (SMTP). When you’re sending an email, your email client uses SMTP to handle outgoing mail. SMTP is responsible for initiating and establishing the communication between the email client and the server to transmit the email data.
2. Download an email from mailbox server to a mail client (m2): For downloading emails from a mail server to a local mail client, two primary protocols can be used: Post Office Protocol version 3 (POP3) and Internet Message Access Protocol (IMAP).
– POP3 is designed for downloading and storing emails locally. This means that once the emails are downloaded, they are typically deleted from the server, making them accessible only from the single device that downloaded the emails.
– IMAP provides more flexibility compared to POP3, as it allows emails to be managed and synced across multiple devices. With IMAP, emails are stored on the server, and copies can be downloaded to various clients. This protocol is ideal for accessing email from different devices, as it keeps the email messages on the server and syncs the changes across all devices.
3. **Checking email in a
D. m1:POP, m2:SMTP, m3:IMAP