Question

--- and --- are the protocols most commonly employed in an exchange of email messages?​

Answer 1

Explanation:

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Answer 2

SMTP and IMAP are the protocols most commonly employed in an exchange of email messages

• The standard for transferring email messages from one mail server to another is SMTP (Simple Mail Transfer Protocol).  
• The standard protocol used by the vast majority of user email accounts in common is IMAP(Internet Message Access Protocol). With IMAP, emails are carefully saved on a secure server on the Internet.  
• When an active user accesses an account, he or she connects to a remote server and transmits data from the server to his or her local machine and receives no email messages of his or her own.