CN SMTP Protocol

Question

SMTP is state full or stateles?

Comments

not confirm, but i think it should be statefull..

what is answer?

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No idea:).I checked online,but didnt get much info

Answer 1

from RFC-5321 -:https://tools.ietf.org/html/rfc5321

SMTP sessions are stateful, with both parties carefully maintaining a
   common view of the current state.

Also,protocols involved in email like

• POP3-:partial stateful
• IMAP-:complete stateful.

Comments

Thank you.

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@Saurav. See this https://gateoverflow.in/39628/gate-2016-1-25 .here it says POP-3 is statefull. It does not say partial statefull

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From Top down approach by kurose and Ross .

POP3 server does not carry state information across POP3 sessions making it partial stateful ,however POP3 server maintains some state information like it marks the message to be deleted.

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yeah,looks ok

Answer 2

SMTP is a stateless protocol as the mail server does not maintain any connection with the client, it does not store any information about the client. If an email is asked to be sent twice, the server will resend it without saying that the email has been sent.

Comments

SMTP is used as MTA( massage transfer agent) means used to push the message to server at sender  side and also used to push massage sender mail server to receiver mail server.that means we don't know when user send the message means SMTP should be active all the time to push the message to mail server ,so SMTP always maintain connection so SMTP is stateful.