Using Dovecot LMTP as LDA - email

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