Debian 10, mail server Exim4

Work in progress!

Goals

Done	Task	Info
[X]	Using Debian 10
[ ]	Exim 4 as mail server
[ ]	Using self created certificate
[ ]	Dovecot for imap access
[ ]	SquirrelMail as web client
[ ]	SpamAssassin for spam filtering
[ ]	Access from Thunderbird
[ ]	Access from Outlook/Mail
[ ]	Backup of mails to a different system
[ ]	virtual users
[ ]	Server side use of SpamAssains header tags to move junk to junk folders (sieve?)

Installation

Installation of exim

• get Debian from https://www.debian.org/
• install exim

apt-get install exim4-daemon-heavy

• configure it

dpkg-reconfigure exim4-config

• apply the configuration

update-exim4.conf

• restart exim

service exim4 restart

• check for port 25

ss -apn | grep exim

TLS / Custom certificate

• edit /usr/share/doc/exim4-base/examples/exim-gencert

vi /usr/share/doc/exim4-base/examples/exim-gencert

• change DAYS to a larger number (20000?)
• look at content of /etc/exim4

ls -l /etc/exim4

• execute /usr/share/doc/exim4-base/examples/exim-gencert
• look at content of /etc/exim4

ls -l /etc/exim4

• Edit update-exim4.conf.conf

vi /etc/exim4/update-exim4.conf.conf

• add use of tls

MAIN_TLS_ENABLE = yes

• apply

update-exim4.conf
service exim4 restart

SPF (Sender Policy Framework)

apt-get install spf-tools-perl

• edit /etc/exim4/update-exim4.conf.conf

CHECK_RCPT_SPF = true

Blacklist

• edit /etc/exim4/update-exim4.conf.conf
• set the variable

CHECK_RCPT_IP_DNSBLS = zen.spamhaus.org

• apply

update-exim4.conf
service exim4 restart

install Spam Assassin

apt-get install spamassassin
systemctl enable spamassassin.service

Install Dovecot

• install it

apt-get install dovecot-imapd

• set mail location in /etc/dovecot/conf.d/10-mail.conf

mail_location = maildir:~/Maildir

• set separator

separator = /

• edit /etc/dovecot/conf.d/15-mailboxes.conf

vi /etc/dovecot/conf.d/15-mailboxes.conf

• modify the structure if needed