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== OVERVIEW & PREPARATION==
Last week, we configured and ran the '''Postfix''' application (MTA a.k.a. SMTP server) on our '''vm2''' and '''vm3''' machines. This setup had a drawback, in that it required an SMTP server to be configured on each machine. The Message Store ('''MS''') would also be unique to each machine: what a user received on one server would not exist on any other. In this lab we will centralize some of this information, so that a user can send email from any machine in the network, and always be able have incoming mail sent to access '''all''' of their maila centralized messages store.
'''The a diagram below (duplicate to lab 4a) shows your basic setup of your email system:'''
[[Image:Email-servers.png]]
We will begin by modifying the existing '''Postfix''' servers to make mail they send come from your domain, instead of each machine. Then we will add a record to your DNS server to allow mail to be sent to the domain itself, instead of the individual machines. Next we will add a Local Delivery Agent ('''LDA''') to your '''vm3''' by installing '''dovecot-lda''', configure it, and test it to make sure that is is working correctly.
Finally, we will set up an '''IMAP''' server (Dovecot) on VM3, so you can read your email from an MUA such as ''Thunderbird'' or a ''Webmail'' (we will set up a webmail application in a later lab).
