Which statement about SMTP is true?
Click on the arrows to vote for the correct answer
A. B. C. D. E.C.
SMTP (Simple Mail Transfer Protocol) is a standard communication protocol used for sending and receiving email messages between email servers. Here are the explanations of each option provided in the question and the correct statement about SMTP:
A. SMTP uses UDP port 25: This statement is incorrect. SMTP uses TCP (Transmission Control Protocol) port 25 for communication between email servers.
B. The POP protocol is used by the SMTP client to manage stored mail: This statement is incorrect. The POP (Post Office Protocol) is used by email clients to retrieve email from a mail server. SMTP is used by email clients to send email messages to an email server.
C. The IMAP protocol is used by the SMTP client to retrieve and manage stored email: This statement is incorrect. The IMAP (Internet Message Access Protocol) is also used by email clients to retrieve email from a mail server. SMTP is only used for sending email messages.
D. The mail delivery agent in the SMTP architecture is responsible for DNS lookup: This statement is incorrect. DNS (Domain Name System) lookup is performed by the email client to resolve the domain name of the email server. The mail delivery agent in the SMTP architecture is responsible for forwarding the email message to the recipient's mail server.
E. SMTP uses TCP port 20: This statement is incorrect. SMTP uses TCP port 25 for communication between email servers.
Therefore, the correct statement about SMTP is that SMTP uses TCP port 25 for communication between email servers.