Question

Why UDP is not a suitable option for Email application? Explain the working of SMPT in detail.

Answer 1

Answer:

SMTP is a text oriented protocol that can transmit a large chunk of text or multiple emails in one session, it mostly uses TLS today. UDP does not support communication channels, so SMTP is suited for TCP.

A typical SMTP dialogue looks like this:

1. HELO clienthost
2. 220 serverhost ready
3. MAIL FROM:<[email protected]>
4. 220 OK
5. RCPT TO:<[email protected]>
6. 220 OK
7. RCPT TO:<[email protected]>
8. 220 OK
9. DATA
10. Subject: testmail
11. From: [email protected]

Answer 2

Explanation:

SMTP is a text oriented protocol that can transmit a large chunk of text or multiple emails in one session, it mostly uses TLS today. UDP does not support communication channels, so SMTP is suited for TCP.

A typical SMTP dialogue looks like this:

HELO clienthost 

220 serverhost ready 

MAIL FROM:<[email protected]> 

220 OK 

RCPT TO:<[email protected]> 

220 OK 

RCPT TO:<[email protected]> 

220 OK 

DATA 

Subject: testmail 

From: [email protected] 

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