I need help with 5 and 8 Study the RFC\'s covering the use of SMTP. 1. What does

Question

I need help with 5 and 8 Study the RFC's covering the use of SMTP. 1. What does SMTP mean? 2. What is the well known port used for SMTP? 3. NOTE: On the smtp server for mnmtek.com, IT USES PORT 26 Port 26 is an alternate well known port used sometimes instead of the usual 4. Using standard the standard way of communicating using STMP, send an email to yourself. Upon success, to a screenshot of your session. as well as a screenshot of the received email 5. Why do you think port 26 is used on this server instead of the well-known port? 6. Show a list of the most common SMTP reply codes (at least 10 of them) 7. When entering the body of an email using SMTP, how do you conclude entry of the information so it will send and you can quit? 8. Can you think of an easy program you could write to send general emails using this protocol? How would you do it?

Explanation / Answer

1. Simple Message Transfer Protocol, used for e-mail routing between mail servers
2. port 25
3. Port 26 is classified by IANA as 'unassigned'
5. in order to try and block spam, they have blocked default port 25 and using port 26 for the same purpose , sending mails
6.

7. When you are finished with the body of your mail , press Enter and than a period and then Enter again to end text entry and your email will be sent . Type quit to end your session with teh SMTP server

8. Yes , you can build your own Java Program or in any other langauge. According to SMTP, when any email program needs to send an email message, that program establishes a two-way transmission channel (by way of sockets) with a primary SMTP server program that is always running on some accessible host, such as your Internet Service Provider's (ISP's) host.Once the connection established , program issues a sequence of ASCII-based commands to the SMTP server program, and the primary SMTP server program replies to each command with an ASCII-based response message indicating success or failure. SMTP recognizes a variety of commands that email programs can use to communicate with SMTP server programs.Six commonly used commands are HELO, MAIL, RCPT, DATA, RSET, and QUIT.

Code Meaning 200 (nonstandard success response, see rfc876) 211 System status, or system help reply 214 Help message 220 <domain> Service ready 221 <domain> Service closing transmission channel 250 Requested mail action okay, completed 251 User not local; will forward to <forward-path> 252 Cannot VRFY user, but will accept message and attempt delivery 354 Start mail input; end with <CRLF>.<CRLF> 421 <domain> Service not available, closing transmission channel 450 Requested mail action not taken: mailbox unavailable 451 Requested action aborted: local error in processing 452 Requested action not taken: insufficient system storage 500 Syntax error, command unrecognised 501 Syntax error in parameters or arguments

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