Which protocol is primarily used to send outgoing email messages from a client device to its mail server?
POP3
SMTP
IMAP
HTTP/S
Simple Mail Transfer Protocol (SMTP) is the correct answer because it is the standard protocol used for transmitting outbound emails from a client to a mail server. HTTP/S is designed for web page access, while POP3 and IMAP are protocols focused on retrieving or synchronizing email from the server rather than sending it.
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