Paweł Botuliński

//add:
# SMTP-Auth settings

smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, permit_sasl_authenticated, reject

// save & quit

root@mailsrv:~# newaliases
root@mailsrv:~# systemctl restart postfix

root@mailsrv:~# vim /etc/dovecot/dovecot.conf

Uncomment
listen = *, ::

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/10-auth.conf

Uncomment „#disable_plaintext_auth = yes” and set to 'no'
disable_plaintext_auth = no

Find option „auth_mechanisms” and add 'login'
auth_mechanisms = plain login

Find 'mail_location' option and set to maildir – it is more efficient than default mbox.

mail_location = maildir:~/Maildir

this option stores mails in home directory, you can also configure it to store in /var/mail/username location:
mail_location = maildir:/var/mail/%u

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/10-master.conf

Uncomment:
unix_listener /var/spool/postfix/private/auth {
mode = 0666
}

and add two lines:
user = postfix
group = postfix

unix_listener /var/spool/postfix/private/auth {
mode = 0666
user = postfix
group = postfix
}

// save & quit

root@mailsrv:~# systemctl restart dovecot

#————————————————————-
Virtual users in Dovecot DB:

Create an administrative account – user 'vmail' to manage virtual mailboxes:

root@mailsrv:~# adduser –uid 20000 –disabled-password –disabled-login vmail

root@mailsrv:~# vim /etc/postfix/main.cf

Comment out line:
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

Add below lines:

virtual_mailbox_domains = botulinski.com, virtual.host
virtual_mailbox_base = /home/vmail
virtual_mailbox_maps = hash:/etc/postfix/virtual-mailbox
virtual_uid_maps = static:20000
virtual_gid_maps = static:20000

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/10-auth.conf

Add 'cram-md5′ option to 'auth_mechanisms':
auth_mechanisms = cram-md5 plain login

Add comment to line:
#!include auth-system.conf.ext

and uncomment these two options:
!include auth-passwdfile.conf.ext
!include auth-static.conf.ext

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/auth-passwdfile.conf.ext

Change 'CRYPT' to 'CRAM-MD5′ in passdb section:
passdb {
driver = passwd-file
args = scheme=CRAM-MD5 username_format=%u /etc/dovecot/users
}

Comment out whole userdb section:

#userdb {
# driver = passwd-file
# args = username_format=%u /etc/dovecot/users

# Default fields that can be overridden by passwd-file
#default_fields = quota_rule=*:storage=1G

# Override fields from passwd-file
#override_fields = home=/home/virtual/%u
#}

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/auth-static.conf.ext

Uncomment userdb section, and set 'home' as below:
userdb {
driver = static
args = uid=vmail gid=vmail home=/home/vmail/%d/%n
}

// save & quit

root@mailsrv:~# vim /etc/dovecot/conf.d/10-mail.conf

Change:
mail_location = maildir:/home/vmail/%d/%n/Maildir

// save & quit

root@mailsrv:~# systemctl restart postfix
root@mailsrv:~# systemctl restart dovecot

#————————————————————-
Add virtual users in Dovecot DB:

root@mailsrv:~# vim /etc/postfix/virtual-mailbox

# create new
# [user account] [mailbox]
paul@mailsrv.com mailsrv.com/paul/Maildir/

root@mailsrv:~# postmap /etc/postfix/virtual-mailbox

Generate encrypted password:
root@mailsrv:~# doveadm pw -s CRAM-MD5
Enter new password:
Retype new password:
{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

//Copy string with encrypted password

root@mailsrv:~# vim /etc/dovecot/users

#Add lines to file (paste encrypted password):

paul@mailsrv.com:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx