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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]
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| '''References'''
| colspan="2" | [1] [https://insideemployees.senecacollege.ca/itsspaces/77/it-services/emailwiki/studentemployeeview/email_clients2394/othermail.html Configuring other Email Clients]<br> [2] [https://ssgoku129.wordpress.com/2012/11/29/how-to-setup-seneca-learnid-myseneca-ca-with-email-clientsITS -and-devices/ How-to setup Seneca LearnID @myseneca.ca with Configuring other Email Clients]
|}
::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 by checking vm2 mail logs</li></ol>
=== Relay Email Through Another Server===
{{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'''
