Install Postfix mail server
Log in as root
open terminal and check if the hash symbol is there.
If so, then you are root and you don't have to type sudo first
root@vps#
apt update
apt upgrade
Postfix & Dovecot:
dig mx checktls.nl
apt install postfix
Choose Internet site and provide mail server domain name. In this case checktls.nl
apt install mailutils
Create a user for info@checktls.nl
useradd -m -s /bin/bash info
And give user info a password:
passwd info
Check if everything works:
postfix status
telnet localhost 25
quit
Test sending an internal email from root to info
telnet localhost 25
ehlo localhost
mail from: root@localhost
rcpt to: info@localhost
data
Subject: My first mail on Postfix
Hi,
Are you there?
regards,
Admin
. (Type the .[dot] in a new Line and press Enter )
quit
Check if the email arrived:
su - info
mail
Back to root:
su - root (password)
postconf -e "home_mailbox = Maildir/"
postconf -e "mailbox_command = "
/etc/init.d/postfix restart
su - info
MAIL=/home/info/Maildir
mail
apt install courier-pop
apt install courier-imap
postconf -e "mydestination = mail.checktls.nl,
localhost.localdomain, localhost, checktls.nl"
postconf -e "inet_interfaces = all"
postconf -e "inet_protocols = all"
service courier-authdaemon start
systemctl enable courier-authdaemon
/etc/init.d/postfix restart
netcat mail.checktls.nl 25
ehlo checktls.nl
mail from: root@checktls.nl
rcpt to: info@checktls.nl
data
Subject: My first mail for my domain
Hi,
Are you there?
regards,
Admin
. (and Enter In a new Line)
quit
su - info
cd Maildir/new
ls
netcat mail.checktls.nl 110
user info
+OK Password required.
pass password
+OK logged in.
quit
certbot certonly --standalone -d mail.checktls.nl
postconf -e 'smtpd_tls_cert_file =
/etc/letsencrypt/live/mail.checktls.nl/fullchain.pem'
postconf -e 'smtpd_tls_key_file =
/etc/letsencrypt/live/mail.checktls.nl/privkey.pem'
postconf -e 'smtpd_sasl_type = dovecot'
postconf -e 'smtpd_sasl_path = private/auth'
postconf -e 'smtpd_sasl_local_domain ='
postconf -e 'smtpd_sasl_security_options = noanonymous'
postconf -e 'broken_sasl_auth_clients = yes'
postconf -e 'smtpd_sasl_auth_enable = yes'
postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination'
sudo postconf -e 'smtp_tls_security_level = may'
sudo postconf -e 'smtpd_tls_security_level = may'
sudo postconf -e 'smtp_tls_note_starttls_offer = yes'
sudo postconf -e 'smtpd_tls_loglevel = 1'
sudo postconf -e 'smtpd_tls_received_header = yes'
sudo postconf -e 'virtual_alias_domains = $mydomain'
sudo postconf -e 'virtual_alias_maps =
hash:/etc/postfix/virtual'
sudo nano /etc/postfix/virtual
postmaster@checktls.nl root
root@checktls.nl root
info@checktls.nl info
bas@checktls.nl bas
sudo postmap /etc/postfix/virtual
sudo systemctl restart postfix
sudo apt install dovecot-imapd dovecot-pop3d
sudo maildirmake.dovecot /etc/skel/Maildir
sudo maildirmake.dovecot /etc/skel/Maildir/.Drafts
sudo maildirmake.dovecot /etc/skel/Maildir/.Sent
sudo maildirmake.dovecot /etc/skel/Maildir/.Trash
sudo maildirmake.dovecot /etc/skel/Maildir/.Templates
sudo adduser bas sudo
sudo cp -r /etc/skel/Maildir /home/$USER/
sudo chown -R $USER:$USER /home/$USER/Maildir
sudo chmod -R 700 /home/$USER/Maildir
sudo adduser $USER mail
as root (has no homedir)
sudo cp -r /etc/skel/Maildir /$USER/
sudo chown -R $USER:$USER /$USER/Maildir
sudo chmod -R 700 /$USER/Maildir
sudo adduser $USER mail
echo 'export MAIL=~/Maildir' | sudo tee -a /etc/bash.bashrc
| sudo tee -a /etc/profile.d/mail.sh
sudo nano /etc/dovecot/conf.d/10-auth.conf
disable_plaintext_auth = yes
auth_mechanisms = plain login
sudo nano /etc/dovecot/conf.d/10-mail.conf
mail_location = maildir:~/Maildir
sudo nano /etc/dovecot/conf.d/10-master.conf
service imap-login {
inet_listener imap {
port = 143
}
}
service pop3-login {
inet_listener pop3 {
port = 110
}
...
}
...
service auth {
...
# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {
mode = 0660
user = postfix
group = postfix
}
sudo nano /etc/dovecot/conf.d/10-ssl.conf
# SSL/TLS support: yes, no, required.
<doc/wiki/SSL.txt>
ssl = required
...
ssl_cert =
</etc/letsencrypt/live/mail.checktls/fullchain.pem
ssl_key =
</etc/letsencrypt/live/mail.checktls/privkey.pem
...
# SSL protocols to use
ssl_protocols = !SSLv2 !SSLv3
sudo nano etc/postfix/main.cf
# No Client initiated renegotiation
tls_ssl_options = NO_RENEGOTIATION
dovecot -n
sudo systemctl restart dovecot
nc mail.checktls.nl 25
EHLO $hostname
MAIL FROM:<root@checktls.nl>
RCPT TO:<info@checktls.nl>
DATA
Subject: Test email
Tessie
.
QUIT
