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[[Category:OPS335]][[Category:OPS335 Labs]]
==Basic Mail (Postfix) Setup==
This lab will show you how to set up a Postfix email server using a Fedora 13 installed PC20 installation.*You will need at least two systems to do this lab. The first could be Fedora on If for some reason you have not set up your removable hard drive while the second could be a virtual machinemachines, do so before continuing.{{Admon/important|Prerequistites|Your hard drive should Ensure all machines have Fedora 13, 64 bit Live edition already installed.<br />You should have at least one VM installed: also Fedora 13, 64 bit Live edition<br />Both your host and guest should have default firewalls enabled.<br />Both host been updated and guest should have all software updated.<br />Ensure that the clocks on both machines are set to the correct date and time.}}
=== Testing your network ===
*Start Firefox on your host and authenticate yourself on Sene2net Senenet with your LEARN Seneca account.*Ensure you can surf the web on your host machine.*Start Firefox on As your guesthost should be using VM 1 as its DNS server, you will need to start it as well.*Ensure you can surf access the web on your guestVM2 (you can use wget or lynx for that). NOTE: you should not have to authenticate yourself on the guest.
===Testing email to Reviewing the outside world using mailx and sendmailmail command ===*Sendmail is installed and running by default on Fedora 13 so there is no need to install it.*Install mailx on both the host and the guest. yum install mailx*Test email from the host by sending an email to your LEARN account. mail -s "PART C3" xxxxxx@learn.senecac.on.ca *Note: xxxxxx is your LEARN ID.*Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.*Check your LEARN email to see if you got the email. If you did make a note of the return address.*Test email from the host by sending an email to your LEARN account. mail -s "PART C4" -r hacker@evil.com xxxxxx@learn.senecac.on.ca*Note: xxxxxx is your LEARN ID.*Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.*Check your LEARN email to see if you got the email. If you did make a note of the return address.*Repeat steps 3 and 4 on the guest machine.===Install and configure Postfixon a VM===*On both machines Vm 2 do the following:**Stop Check the status of the sendmailservice. service sendmail If it show up as running or enabled, stopand disable it. **Install Postfixand mail yum install postfixmailx**While that is installing, you may wish to read the mail manual page to remind yourself how it works.**Edit the Postfix configuration file, /etc/postfix/main.cf, and change the following linesparameters: mydomain = example<senecaID>.org
myorigin = $mydomain
relay_domains =
inet_interfaces=all {{Admon/important|Warning|Make sure there are no other uncommented copies of these parameters in the file.}} **Create the database file of mail aliases postalias hash:/etc/aliases **Start and enable Postfix on both machines: systemctl start postfix.service systemctl enable postfix.service **Check your /var/log/messages file to see that your postfix start servers started without error.***If there are any errors, correct them before continuing. ===Testing mail with the internet===*Test email from your machine by sending an email to your Seneca account. mail -s "PART C3" <Your Seneca email address>Note: <Your Seneca email address> is your Seneca email address.<br />Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.*Check your learn email to see if you got the email (note that it may take a few minutes to arrive, so you may also wish to try an alternate email account if you have one). When you do receive that email make a note of the return address.*If you did not receive the mail, check the mail logs on your machine to determine what the error is.*Test email from the host by sending an email to your Seneca account. mail -s "PART C4" -r hacker@evil.com <Your Seneca email address><br />Note: after you type in your letter, enter a period in the first column on the last line and hit the ENTER key.*Check your Seneca email to see if you got the email. If you did make a note of the return address.*Repeat the steps for 'Install and Configure Postfix on a vm' on your VM 3.
===Testing email using IP Addresses===
*If you have problems with the following you may have to set SELinux to permissive mode and/or adjust Adjust your firewall to allow traffic to/from port 25on both VMs.**Also check your /var/log/maillog file to see the log entries that get created when mail is sent and received, and when something goes wrong.*Try sending an email from your guest vm2 to your hostvm3. mail -s "PART E2" yyyyyy@[192.168.122X.14]Note: yyyyyy is your host Seneca ID<br />
Note: the square brackets around the host IP address
*Try sending an email from your host vm3 to your guestvm2. mail -s "PART E3" zzzzzzroot@[192.168.122X.ZZZ3] Note: zzzzzz is your guest IDNote: ZZZ is your guest IP address===Set up a DNS server===
Now try sending mail to yourself on both machines. For example, as <senecaID> on VM 3, use the command: $ mail joker<senecaID>@f13vm2.<yourdomain>.org
the machine will prompt for a subject: enter "testing" without the quotes.
*Now enter the body of your letter. When you're done, enter a period (.) in column 1 on the last line of your letter. This will signal end-of-file and your letter will be mailed. You should end up back at the $ prompt. If you mess up use CTRL-C to cancel the email, DO NOT USE CTRL-Z. *Use the mailq command on both machines (you will need to be root) to view the mail queue.
Use the mail command to check if you have mail.