Mail Server : Add Mail Accounts (Virtual User)2021/05/21

	Add Mail Accounts (Virtual User). This example is for the case you use virtual mail-user accounts, not use OS user accounts.
[1]	Configure basic Postfix settings, and basic Dovecot settings first.
[2]	Configure additional settings to Postfix and Dovecot.

# create a admin user for virtual mailboxes

root@mail:~#

adduser --uid 20000 --disabled-password --disabled-login vmail

root@mail:~#

vi /etc/postfix/main.cf

# line 185 : comment out

mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

# add to the end

# if specify multiple domains, specify comma or space separated
virtual_mailbox_domains = srv.world, 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

root@mail:~#

vi /etc/dovecot/conf.d/10-auth.conf

# line 100 : add

auth_mechanisms =

cram-md5

plain login

# line 122 : comment out

!include auth-system.conf.ext

# line 125 : uncomment

!include auth-passwdfile.conf.ext

# line 127 : uncomment

!include auth-static.conf.ext

root@mail:~#

vi /etc/dovecot/conf.d/auth-passwdfile.conf.ext

# line 8 : change

passdb {
  driver = passwd-file
  args = scheme=CRAM-MD5 username_format=%u /etc/dovecot/users

# line 11 : comment out [userdb] section all

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

root@mail:~#

vi /etc/dovecot/conf.d/auth-static.conf.ext

# line 21-24 : uncomment and change

userdb {
  driver = static
  args = uid=vmail gid=vmail home=/home/vmail/%d/%n
}

root@mail:~#

vi /etc/dovecot/conf.d/10-mail.conf

# line 30 : change

mail_location = maildir:

/home/vmail/%d/%n/Maildir

root@mail:~#

systemctl restart postfix dovecot

[3]	Add virtual mail user accounts.

root@mail:~#

vi /etc/postfix/virtual-mailbox

# create new

# [user account] [mailbox]

ubuntu@srv.world   srv.world/ubuntu/Maildir/
debian@virtual.host   virtual.host/debian/Maildir/

root@mail:~#

postmap /etc/postfix/virtual-mailbox

# generate password

root@mail:~#

doveadm pw -s CRAM-MD5

Enter new password:
Retype new password:
{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

root@mail:~#

vi /etc/dovecot/users

# create new

# [user account] [password]

ubuntu@srv.world:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
debian@virtual.host:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

[4]	That's OK. Verify to test to send emails on Mail client. For this settings, specify email address for [Username] on Email Client settings.

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