Which protocol is used to send e-mail messages between two servers that are in different e-mail domains?

Which protocol is used to send e-mail messages between two servers that are in different e-mail domains?

• POP3
• SMTP
• HTTP
• IMAP4

Explanation: SMTP is used to send data between mail servers and to send data from a host to a mail server. The other two protocols that can be used for email are IMAP and POP3. IMAP and POP3 are used to download email messages from a mail server.

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