Which port is used by the SMTP server by default to receive mail?

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Multiple Choice

Which port is used by the SMTP server by default to receive mail?

Explanation:
Port 587 is the SMTP submission port. It’s the path clients use to submit mail to an SMTP server, typically with authentication and often TLS encryption. This makes it the appropriate port for the SMTP server to receive mail from end-user mail clients. The traditional port 25 is mainly for server-to-server SMTP relaying, not end-user submission. Ports 110 and 143 are for retrieving mail (POP3 and IMAP, respectively), not submitting it.

Port 587 is the SMTP submission port. It’s the path clients use to submit mail to an SMTP server, typically with authentication and often TLS encryption. This makes it the appropriate port for the SMTP server to receive mail from end-user mail clients. The traditional port 25 is mainly for server-to-server SMTP relaying, not end-user submission. Ports 110 and 143 are for retrieving mail (POP3 and IMAP, respectively), not submitting it.

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