Using Dovecot LMTP as LDA

Question

I am trying to set up a postfix mail server with dovecot as MDA. According to this link to set up dovecot to use LMTP I have done the following config.

postfix

main.cf

virtual_transport = lmtp:unix:private/dovecot-lmtp

master.cf

submission inet n       -       y       -       -       smtpd
  -o syslog_name=postfix/submission
  -o smtpd_tls_security_level=encrypt
dovecot   unix  -       n       n       -       -       pipe
   flags=DRhu user=vmail:vmail argv=/usr/bin/sudo /usr/lib/dovecot/deliver -f ${sender} -d ${user}

dovecot

dovecot.conf

protocols = imap lmtp

10-mail.conf

mail_privileged_group = mail

10-master.conf

service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    mode = 0600
        user = postfix
        group = postfix
  }
  # Create inet listener only if you can't use the above UNIX socket
  #inet_listener lmtp {
    # Avoid making LMTP visible for the entire internet
    #address =
    #port = 
  #}
}

The mailboxes will be present in user's home directory /users/<username> As stated by the link /users is the home directory of vmail user. However with this config when I try to send mail like: mail -s "subj" username

The mail bounces saying warning: maildir access problem for UID/GID=<uid>/<gid>: create maildir file ~username/Maildir/tmp/<tmp file>: Permission denied

The ownership of ~username is vmail:vmail However the mail is successfully sent when the ownership is changed to <user>:<group> for each user. How can I get this thing working with the mail directory ownership kept as vmail:vmail ?

Note: I am not trying to set up SASL as of yet. I am just tryin

Answer 1

You need to change ownership users and groups using below mentioned command.

example:-

chown -R user:group /path/to/file

-R --> recursive option