Hi Irek
I had pretty much the same requirements for my mail server at home as
you have. Over the time I got different mail accounts for different
purposes. So I wanted to consolidate all the accounts on my own server
running in my home network. Since several years (and releases) I'm
running my home mail server under OpenBSD.
The server is not directly reachable as a MX host because I only use a
DynDNS address to access it from outside through a proxy server (nginx
for IMAP and SMTP) also running OpenBSD.
My mail server fetches the mails from all accounts via POP3 with
fetchmail. The mails are delivered to Postfix which acts as the mail
server for my internal domain at home. Postfix then delivers the mail to
my personal user account on the server using procmail. Procmail runs
each mail through ClamAV (antivirus) and SpamAssassin (antispam). Mails
containing viruses are delivered to /dev/null, mails recognized as spam
are delivered to the Spam folder. Every other mail is delivered to the
mail folder specified in the procmail receipt or, if there is no other
destination specified in .procmailrc, to the INBOX.
All mails are stored in ~/mails which is a Maildir folder structure. I
prefer Maildir to store mails because it creates a file for each mail.
This make backup and restore much easier.
I use Courier IMAP to access all my mails through IMAP clients like
Thunderbird (on all my clients) and - since some days - BlackBerry Z10
(access from the Internet through the IMAP proxy feature of nginx). This
way I have always the same sight on my mailbox, no matter which client I
use. No more manual sync or having mails downloaded to the "wrong"
client. My Maildir folders also act as the archive for my mails.
All components on my mail server support of course TLS. I've configured
Postfix and Courier IMAP to support TLS. For this I use my personal PKI.
It is based on a self-signed root CA with two sub CAs, one for client
certificates and one for server certificates.
I make an hourly backup of my mails folder using rsync to one of my
NAS. Additionally there is the daily backup using dump of the whole mail
server.
I hope my explanations give some ideas about how you could solve your
problem. Feel free to contact me if you would like to get more details
about the configuration.
Best regards,
Bruno
