smtp authentication virtual domain ubuntu 14.4

Question

two domains configured as virtual domains and ubuntu 14.4 installed:

I need to configure smtp authentication for dovecot, without authentication it is working I have go through several docs but non of these are suit for my solution

regards Kanchana

###################### refer the doveconf -n

root@mail:/var/log# doveconf -n
# 2.2.9: /etc/dovecot/dovecot.conf
# OS: Linux 3.13.0-32-generic x86_64 Ubuntu 14.04.1 LTS ext4
auth_mechanisms = plain cram-md5
auth_verbose = yes
base_dir = /var/run/dovecot/
info_log_path = /var/log/dovecot.info
log_path = /var/log/dovecot
log_timestamp = "%Y-%m-%d %H:%M:%S "
mail_location = maildir:/home/vmail/%d/%n
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy include variables body enotify environment mailbox date ihave
passdb {
  args = /etc/dovecot/passwd
  driver = passwd-file
}
protocols = imap pop3
service auth {
  executable = /usr/lib/dovecot/auth
  user = root
}
service imap-login {
  chroot = login
  executable = /usr/lib/dovecot/imap-login
  user = dovecot
}
service imap {
  executable = /usr/lib/dovecot/imap
}
service pop3-login {
  chroot = login
  executable = /usr/lib/dovecot/pop3-login
  user = dovecot
}
service pop3 {
  executable = /usr/lib/dovecot/pop3
}
ssl = no
userdb {
  args = /etc/dovecot/users
  driver = passwd-file
}
valid_chroot_dirs = /var/spool/vmail
protocol pop3 {
  pop3_uidl_format = %08Xu%08Xv
}

Answer 1

Based on the output of doveconf -n, Dovecot is not set to handle SMTP SASL authorizations from Postfix. You can try adding the following to your /etc/dovecot/conf.d/10-master.conf file:

# Add SMTP SASL authorizations from Postfix:
service auth{
unix_listener auth-userdb{
}
inet_listener {
port=12555
}
}

And in your /etc/postfix/main.cf file, add the following:

# Add Dovecot listener for SASL authorizations:
smtpd_sasl_type=dovecot
smtpd_sasl_path=private/auth
smtpd_sasl_path=inet:127.0.0.1:12555

The # at the start of a line to add comments about the changes so you can keep track of what you changed - I recommend you do this in case you need to go back and remove the edits.

The port number 12555 is arbitrary, but make sure to use a port that is not being used for any services. Port 12555 isn't used for any common services which is why I selected it.

Restart Postfix and Dovecot with sudo service postfix restart and sudo service dovecot restart. See if this allows SMTP authorizations through Dovecot.