Sendmail Lab Part 1. /usr/share/sendmail-cf/readme
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1 Sendmail Lab Part 1 The sendmail program was originally written by Eric Allman while he was a student and staff member at the University of California at Berkeley. The sendmail program plays a variety of roles: Listens to the network for incoming mail, Transports mail messages to other machines Hands local mail over to a local program for delivery Appends mail to files, Pipes mail through other programs, Queues mail for later delivery Understands the aliasing of one recipient name to another Objectives: (1) Study the default SENDMAIL configuration file supplied with your Linux distribution. (2) Use SENDMAIL to send electronic messages to local users, and files. (3) Explore and manage SENDMAIL's mail queue. Prerequisite: Complete STMP Lab. You should do this lab on the same machine as you did your SMTP lab. Reference: Distribution CentOS 5.x Documents /usr/share/sendmail-cf/readme IMPORTANT: Some of the commands in this lab must be execute as root. Please login as a regular user and su - to root when necessary. 1. Version Information: Program/Package Name Version GNU/Linux Distribution CentOS 5.x / RHEL 5.x sendmail rpm sendmail-cf rpm sendmail-doc rpm sendmail-devel rpm 2. The name of the sendmail configuration file is called sendmail.cf. Use the rpm -ql command to determine which of the above four packages contains the file and find out its path. (hint: rpm -ql [package name] grep sendmail.cf) Path: Package: OPS535 Lab Sendmail Part 1 November 2009 Page 1 of 6
2 3. Change to sendmail.cf's directory, execute the following command and record the output: grep AliasFile sendmail.cf Output: 4. The output from step 3 indicates which file will be used as the mail aliases file. According to RFC822, all user names are case-sensitive except the name postmaster. But sendmail, when processing its aliases file, views all names as case-insensitive. Substitute the word AliasFile by the actual file name of the aliases file and execute the following command. Record the output. grep ops535 AliasFile Alias Name ops535 postmaster smtp-lab Aliase List Execute the following commands and answer questions (a) and (b): /usr/sbin/sendmail -v -bv postmaster /usr/sbin/sendmail -v -bv smtp-lab (a) If a message is addressed to postmaster, who will actually receive the message? (b) If a message is addressed to smtp-lab, who will actually receive the message? 5. Study the sendmail aliases file in your system. If you want all the messages addressed to postman in you machine to go into your mail box ( you will get those mails when you login to the system using your own login account), add the following line to the alias file: postman: your_user_name Sendmail does not read the aliases file directly, instead, it reads the dbm version of the aliases file called aliases.db. Execute the command newaliases to update the aliases database file. Run the newaliases command and record the output. 6. To verify that the alias for postman works as expected, create a file called mail.txt and execute the following command: /usr/sbin/sendmail -v postman < mail.txt OPS535 Lab Sendmail Part 1 November 2009 Page 2 of 6
3 Can you access the mail message for postman under your user account? 7. Add the following line to your sendmail aliases file: ops535: /tmp/ops535.mail Use vi to create a new file called test.mesg in your home directory with the following contents: Every aliases file must have an alias for postmaster that will expand to the name of a real user. Mail problems encounter by the maildaemon is always sent to postmaster. Save both files and execute the newaliases and the sendmail command: /usr/sbin/sendmail v ops535 < /tmp/test.mesg Record the output of the above command (use the back of this page if you need more space). 8. Check the /tmp directory for the file ops535.mail and determine the following: (a) Who is the owner of the file /tmp/ops535.mail? (b) Who has read permission on that file? (c) What is the Return Path indicated in the message header? (d) What is the Message ID? 9. Edit your sendmail aliases file and add your login name to the postmaster aliases list. After you save the change to your sendmail aliases file, issue the following command: /usr/lib/sendmail bi and record the output. Which command has the same function as the command /usr/lib/sendmail -bi? Issue the following command to determine who will received messages send to postmaster. 10. Send a test message to the user postmaster with the following command: /usr/sbin/sendmail v postmaster < /tmp/test.mesg OPS535 Lab Sendmail Part 1 November 2009 Page 3 of 6
4 Record the last 10 lines from the above command. 11. Login to another virtual terminal with your login account name. Is there any new mail for you? What is the message ID of the ? Sendmail's mail queue 12. Change to sendmail's configuration directory and execute the following command and record the output: grep QueueDirectory sendmail.cf Enter the command mailq and mailq -Ac as root and record the outputs: 13. The output of the above command indicates the directory used by sendmail to store outgoing messages that need to be transferred later. Does regular user has access to this directory? Directory name: Directory Permission: 14. In general, sendmail does not deliver messages directly to local user's mail box. Sendmail calls other programs (mailers) to perform local delivery. To find out the name of the local delivery agent(s) known by sendmail, try the following command: grep ^Mlocal sendmail.cf According to the output from the above command, Name of local delivery agent : 15. Make sure that your machine CAN NOT reach out to Internet. Issue the following command (as root) and record the output: OPS535 Lab Sendmail Part 1 November 2009 Page 4 of 6
5 /usr/sbin/sendmail bv Is the above address deliverable by your sendmail? _ If your sendmail can handle the above address, issue the following command and record the output: /usr/sbin/sendmail v rchan@senecac.on.ca < /tmp/test.mesg 16. Issue the command mailq Ac and mailq and record the entire output. What is the name of the queue directory? How many queue directories are there? If there are messages in the queue, determine the following information for the 1 st message on the output list: Q-ID (message id): Size: Queue Time: Sender/Recipient: OPS535 Lab Sendmail Part 1 November 2009 Page 5 of 6
6 17. Issue the command /usr/sbin/sendmail bp. Compare the output with the command mailq. The output from the two commands are: Make sure that you are login as root. Go to the queue directory and use ls -l to display the files in that directory. Files in this directory should be shown up in pairs: one start with d and the other with q. What information is stored in those d and q files? d file: q file: What are the string of characters after the letter d and q represent? Remove one pair of those file and then execute the command mailq again. Compare the output with the previous output and explain the differences. _ Questions: 1. What is the file own and file permission of the file /tmp/ops535.mail? 2. What is the absolute path and access permission of directory used by sendmail to store outgoing messages? 3. What command would you use to check whether a specific address is deliverable by sendmail? 4. What are the sting of characters after the letter d and q of name of the files in the mail queue? 5. How would you delete an going message which is sitting in the queue directory? Answer the above questions and submit to your instructor by the due date. OPS535 Lab Sendmail Part 1 November 2009 Page 6 of 6
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