Which of the following is a protocol used between email servers?
A. SMTP
B. IMAP4
C. SNMP
D. SIP
A
Explanation: POP and IMAP are client email protocols used for retrieving email, but when email servers are talking to each other they use a protocol called Simple Mail Transfer Protocol (SMTP), a standard application layer protocol. This is also the protocol used by clients to send email.
Computer Science & Information Technology
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