Mail Server : Add Mail User Accounts (Virtual User)

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

# create an admin user for virtual mailboxes [root@mail ~]#  useradd --uid 20000 --shell /sbin/nologin vmail [root@mail ~]#  vi /etc/postfix/main.cf # line 183 : comment out # mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain # line 438 : change home_mailbox =  /home/vmail/%d/%n/Maildir # 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 128 : 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 all [userdb] section #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] cent@srv.world srv.world/cent/Maildir/ fedora@srv.world srv.world/fedora/Maildir/ redhat@virtual.host virtual.host/redhat/Maildir/ [root@mail ~]#  postmap /etc/postfix/virtual-mailbox # generate encrypted 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] cent@srv.world:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx fedora@srv.world:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx redhat@virtual.host:{CRAM-MD5}xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

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