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I was given an opportunity to setup an email system for a friend that is similar to mine, so I figured I’d document this a bit better than what i’ve been documenting before.
As a primer, this is how we use sendmail, dovecot, and php to get email at a host and have it automatically move messages between email inboxes. Fairly easy 🙂
This should be a bit better than my previous partial writeups, specifically email.heick.email, sendmail & dovecot, how do you work…, and Dovecot IMAP (part 1).
Table of Contents:
Base System Setup
To make sure I don’t futz anything up I decided to do a kick-off session in VirtualBox with a Centos 6.9 base. I used the minimal installation media, setup the domain, activated the networking with DHCP, set the root password, and got things underway.
After installation was done and the OS was rebooted, I proceeded to create myself a user, visudo that user for godness, set selinux to permissive, and reboot. Some standard maintenance before we proceed with awesomeness.
The commands are pretty much copypasta. As root:
As myself:
Software Installation
Impaicant
We know from previous write-ups that we have a base of software to install that will get us our mail server capabilities.
Dovecot IMAP Configuration
Dovecots configuration for what we need it to do is fairly straightforward, as we want the *@domain.com setup. All email going to the inbox will eventually be scripted out and delivered to a specific IMAP folder for easy sorting.
Users
Firstly, we’ll need a system-level user that has a home folder. This specific user is simply for permissions and resource segregation. Since we’re on this whole “magic”-imap deal, we’ll keep with the imapic setup. In a real-world scenario
Secondly, we’re gonna go the cheap route and create a passwd file that allows the user to login with a plaintext username/password and associate themselves with the system user. It is important in this case to duplicate the uid/gid from the system user we’ve created in the previous example. We’ll manufacture the file in /etc/dovecot as users
So, now there is a system user named imapic with the password password, and a dovecot user with the same name but a password of derp.
Kmspico Github
We now need a configuration for dovecot to read the users mail as their inbox.
Configuration
All configurations for dovecot is in /etc/dovecot/conf.d. We’ll just copy/paste our defacto config into there.
For the sake of config loading and naming, we’ll call this 99-awesome.conf
The config is actually very easy to read:
- Setup protocols to read mail
- Setup where we store IMAP folders (in the users home folder under ~/mail), and what file we determine as the main INBOX (where mail is delivered to)
- Setup how we want to authenticate, and include the standard “passwordfile” auth configuration
- Make it so that we can have multiple connections to the server from the same IP Address
Kickoff
I always like to make sure I’ve got a message waiting for me, so I’ll send a dumb email to myself:
..and i’ll start dovecot
and see if all is okay by talking directly to dovecot:
Debugging
Ah, seems we have an error! It recommends to check error logs located at /var/log/maillog:
Our mail file is owned by our user, but it needs to also be a member of the same group for dovecot to even think about reading it.
So, lets fix that up:
and we try again:
Perfect! We have access to our inbox and we have 1 mail waiting for us.
Sendmail Configuration
Sendmail already works like a charm. We just need to tell it about our “new domain”, and what to do with messages destined to it.
For all this, we’re gonna work as root and in /etc/mail
local-host-names
This file contains all of the alternate host names of the server (i.e. domain-name.com). Sendmail will not accept mail for a domain unless it is permitted to do so by the contents of this file.
With all that written, we’ll add our domains in this file.
virtusertable
This file is heavily documented, but it comes down to adding the rule that all mail to the domain goes to the system account that we created back in the dovecot days.
If we wanted mail from derp@domain.com to go to a different system account and not be dropped into the imapic “public” box, we’d add that rule above the one we’d created.
sendmail.mc
This, by far, is just something that I don’t personally understand. Items would need to be commented or changed to allow specific actions:
Add all the following to the bottom of the file:
Authentication rules:
Allow connections through a primary and secondary port for sending email messages:
To save a headache later on, delete any lines in the sendmail.mc that contain any configurations above.
Once you’ve saved everything, compile:
Kickoff
As simple as starting/restarting the services:
Also, you might want to check if postfix has 25. Stop that if necessary.
Testing
Once you’ve started everything necessary, test to make sure you can connect and authenticate with the server. It will use system username/passwords to login, so you can create a test user before telnetting and testing:
dGVzdA, in base64, is “test”. It’s both the username and password for this specific test account.
Service Wrap-up
Kmspico Setup
Finally, after all this testing and configuration, we need to make sure we don’t have to do much more maintanance in case of server restart:
PHP Automation
Part of the magic of all this is to now use the power of scripting to automatically “move” all incoming email to specific mailboxes.
So, we’ll need to install some additional software:
Genshin Impact Codes
And, as the all-mighty root, we setup imap-mail-mover.php
Ima Pic
and, finally, we set some cron job to execute it: