School of Computer Studies Seneca College. SMTP Lab SIMPLE MAIL TRANSFER PROTOCOL
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1 SMTP Lab Reference: RFC821 Simple Mail Transfer Protocol SIMPLE MAIL TRANSFER PROTOCOL 1. INTRODUCTION The objective of Simple Mail Transfer Protocol (SMTP) is to transfer mail reliably and efficiently. SMTP is independent of the particular transmission subsystem and requires only a reliable ordered data stream channel. Appendices A, B, C, and D describe the use of SMTP with various transport services. A Glossary provides the definitions of terms as used in this document. An important feature of SMTP is its capability to relay mail across transport service environments. A transport service provides an interprocess communication environment (IPCE). An IPCE may cover one network, several networks, or a subset of a network. It is important to realize that transport systems (or IPCEs) are not one-to-one with networks. A process can communicate directly with another process through any mutually known IPCE. Mail is an application or use of interprocess communication. Mail can be communicated between processes in different IPCEs by relaying through a process connected to two (or more) IPCEs. More specifically, mail can be relayed between hosts on different transport systems by a host on both transport systems. - RFC821 Objective: Explore the command/response transaction of the Simple Mail Transfer Protocol This lab consists of three parts. We will first check the version of the SMTP server and make sure that the SMTP port is on. Secondly, we will establish an interactive SMTP session with the local SMTP server and study some of the major SMTP commands. Lastly, we will use the interactive SMTP session to send to users on the local machine. Part I: SMTP Server (1) Login to you system as a regular user. The default SMTP server installed by Red Hat Linux is sendmail. Find out which version of the sendmail rpm is installed in your system. : Sendmail Version: (2) SMTP server use one of the well-known ports. What is the port number used by SMTP? Page 1 of 6
2 (3) There are two places (or commands) you can check to see whether a SMTP server is running on your system. The 1 st one is the output of the netstat -a command. Look for the SMTP port number under the Local Address column and record the line(s) that contain the SMTP port : If you can't find any, you may have to start or restart the SMTP server. For Red Hat, you can try the following command to restart sendmail (which is Red Hat's default SMTP server): service sendmail restart or service sendmail start (su to root first) (Note: For other Linux distribution or Unix, they may use a different SMTP server.) (4) The other place is the output of the ps -ef grep sendmail command. Record its output: According to the output above, is sendmail accepting connection? (Note: You need a different command if the system is running other SMTP server.) Part II: SMTP commands (5) Login as a regular user and execute the commands under the column and record the output under the column. Do not proceed if the first command can not establish a connection to port 25 on the local host. EHLO domain.com NOOP RSET VERB Page 2 of 6
3 EXPN ops535m VRFY toronto VRFY nobody HELP (6) su to root and backup the file /etc/mail/sendmail.cf to /etc/mail/sendmail.cf.org. (7) While you are still su to root, edit the file /etc/mail/sendmail.cf, change the line: to: O PrivacyOptions=authwarnings,novrfy,noexpn,restrictqrun O PrivacyOptions=authwarnings,restrictqrun (8) Save the changes and restart sendmail server. (9) Login as a regular user and execute the commands under the column and record the output under the column. EXPN ops535m VRFY toronto VRFY postmaster EXPN postmaster VRFY mailer-daemon EXPN mailer-daemon VRFY manager VRFY somebody Page 3 of 6
4 (10) su to root, backup the file /etc/aliases to /etc/aliases.org and execute the following command: echo ops535m: newaliase adm,uucp,ftp >> /etc/aliases (11) Record the output of the above commands: _ (12) Login as a regular user and execute the command sunder the column and record the output under the column. EXPN ops535m produce the output) VRFY ops535m product the output) (13) In the NFS Lab, you were ask to create User 1, User 2 and User 3 with the UIDs 1001, 1002 and Look up the login name from your /etc/passwd file and record them in the following table: UID Login_name User Name (The 5 th field of a /etc/passwd record) User User User (14) su to root and execute the following commands, replace the place holder user1, user2 and user3 with the actual login name from the above table: echo ops535x: newaliase user1,usr2,user3 >> /etc/aliases (15) Login as a regular user and execute the commands under the column and record the output under the column. Page 4 of 6
5 EXPN ops535x produce the output) VRFY ops535x produce the output) (16) Compare the results from step 5, 9, 12 and 15 and comment on the results. Page 5 of 6
6 Part III Sending s (17) Login as a a regular user and connect to the local SMTP server. Use the information in the following table to send to user1, user2 and user3 (please translate them into their actual login names on your system), postmaster, ftp, ops535m and ops535x. From To Message ws.podx.ca user1 SMTP Lab message for User 1 Test message 1. ws.podx.ca user2 SMTP Lab message for User 2 Test message 2. ws.podx.ca user3 SMTP Lab message for User 3 Test message 3. ws.podx.ca ops535x SMTP Lab message for ops535x Test message 4 ws.podx.net postmaster SMTP Lab message for postmaster Test message 5 ws.podx.net ftp SMTP Lab message for ftp Test message 6 ws.podx.net ops535m SMTP Lab message for ops535m Test message 7 (18) Login as user1, user2 and user3 and find out what messages they received: User Login_name Message receiced User 1 User 2 User 3 (19) Find out who received the messages addressed to postmaster (Test message 5), ftp (Test message 6) and ops535m (Test message 7) (20) Write up the complete procedure on how to setup on your system a mail alias called poduser that includes all users in your group? Page 6 of 6
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