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→INVESTIGATION 1: INSTALL THUNDERBIRD (MUA) and SETUP A REFERENCE CLIENT
===Online References===
* [https://help.ubuntu.com/community/Dovecot Dovecot Community Documentation]
* [http://wiki.dovecot.org/LDA Dovecot-lda]
* [http://wiki.dovecot.org/LDA/Postfix Configuring dovecot-lda with postfix]
| '''Username'''|| yoursenecauserid@myseneca.ca || yoursenecauserid@myseneca.ca
|-
| '''servername''' || pod51038outlook.outlookoffice365.com || pod51038outlook.outlookoffice365.com
|-
| '''port''' || 993 || 587
| '''security''' || SSL/TLS || STARTTLS
|-
| '''ReferenceReferences''' | colspan="2" | [1] [https://ssgoku129employees.wordpresssenecacollege.comca/spaces/77/it-services/2012wiki/11view/292394/how-to-setup-seneca-learnid-myseneca-ca-withother-email-clientsITS -and-devices/ How-to setup Seneca LearnID @myseneca.ca with Configuring other Email Clients]
|}
{{Admon/important |Unencrypted Options|Notice that there are <u>unencrypted</u> options available to connect to your SMTP/IMAP servers but those are rarely used these days - the potential for abuse is too great. On a free wifi network, the operator would be able to not only read your email, but also obtain your password without any password/encryption cracking tools. In fact, even on a private wired network, it is not uncommon for an employer to use a packet sniffer utility to monitor all the traffic going over their network (Packet Sniffing applications were actually found to be legally acceptable practices practice if used by the management of organizations)}}
<br>
<ol><li value="3">After you create your '''Thunderbird''' account, you should be able to read your existing email and send new email within the Thunderbird application.</li><li>Take time to view your ''Account Settings'' and ''Preferences'' to get a feel for what settings exist. For example:<ul><li>How often will Thunderbird check for new messages?</li><li>Will the messages you write be in HTML or plain text?</li><li>How do you change your SMTP server settings? Why are they in a different section?</li></ul></li><li>The main objective of this section was to learn how to setup your Thunderbird application to read your Seneca email, so in the next section you can use the exact type of setup for your own email server.</li></ol>
::In order for this to work, we need to add a DNS record that will point mail sent to the domain towards one of the SMTP servers configured to accept it.
<ol><li value="5">Add an '''MX''' record to the forward lookup zone on '''host''' so that all incoming mail addressed to the domain is sent to your vm3.</li><li>Restart the service and use the '''dig''' command to confirm that it works.</li><li>Send an email from your '''vm2''' to '''root@yourdomain.ops'''</li><li>Confirm that it arrives on your '''vm3''' machine.</li></ol>
=== Relay Email Through Another Server===
#The configuration file for the Dovecot service (which is not the same thing as dovecot-lda) is: '''/etc/dovecot/dovecot.conf'''. Modify the '''protocols''' option so that Dovecot will work with IMAP connections, no POP3 or LMTP.
# Start the dovecot service, and ensure it will always start automatically when the machine boots.
# Use the '''ss''' command to confirm the service is listening, and use '''nc ''' on the '''host ''' to confirm you can connect to it.# Using You'll probably fail, so using the information gathered from '''ss''', modify the firewall on vm3 to allow IMAP connections from your local networkand try '''nc''' again. Remember Once it works, do not forget to save this change so it will still be there the next time you reboot.
#If you can connect - it's now time to do something wrong, that is allow connections to our IMAP server over an unencrypted connection.
# Edit the '''/etc/dovecot/conf.d/10-auth.conf''' file and set '''disable_plaintext_auth''' to '''no'''.
{{Admon/important |Encountering error messages when sending email|If you cannot properly receive sent e-mail messages, check the '''/var/log/syslog''' file for errors.<br><br> If you locate an error message in that file such as: '''Fatal: Error reading configuration: Invalid settings...''', then add the following <u>parameter</u> in '''/etc/dovecot/dovecot.conf''':<br />'''postmaster_address <nowiki>=</nowiki> DOMAIN''' (where DOMAIN is actually <u>your</u> domain).<br /><br />After you have saved those changes, then '''restart''' your dovecot service. This problem can also be resolved by properly setting the hostname of your machine to include the domain.}}
{{Admon/important |Backup your VMs!|You MUST perform a '''full backup''' of ALL of your VMs whenever you complete your '''OPS335 labs''' or when working on your '''OPS335 assignments'''. You should be using the dump or rsync command, and you should use the Bash shell script that you were adviced to create in order to backup all of your VMs.}}
'''Record steps, commands, and your observations in INVESTIGATION 3 in your OPS335 lab log-book'''
== COMPLETING THE LAB ==
Follow the instructions for lab 4b on blackboard.
<!--
===Andrew's sections===
::<span style="color:green;font-size:1.5em;">✓</span>Download and run '''wget https://ict.senecacollege.ca/~andrew.smith/ops335/labcheck4b.bash''' on your '''c7host''' machine.
::<span style="color:green;font-size:1.5em;">✓</span>Completed Lab4b log-book notes.
-->
==EXPLORATION QUESTIONS==
