HOWTO: Use Dovecot's deliver & report quota through imap

protocol imap {
  mail_plugins = quota imap_quota
}

protocol pop3 {
  mail_plugins = quota
}

auth default {
  socket listen {
    master {
      path = /var/run/dovecot/auth-master
      mode = 0600
      user = mail # User running deliver
    }
  }
}

protocol lda {
  postmaster_address = [email protected]
  hostname = yourhost.example.com
  auth_socket_path = /var/run/dovecot/auth-master
  mail_plugins = quota
}

plugin {
  quota = maildir
  quota_warning = storage=95%% /usr/local/bin/quota-warning.sh 95
  quota_warning2 = storage=80%% /usr/local/bin/quota-warning.sh 80
}

#!/bin/bash

PERCENT=$1
FROM_SMTP="[email protected]"
FROM="Support <[email protected]>"
qwf="/tmp/quota.warning.$$"

echo "From: $FROM
To: $USER
Subject: Your mailbox usage is $PERCENT% full
Content-Type: text/plain; charset="UTF-8"

Dear customer,

Your mailbox is $PERCENT% filled. Please remove some messages to
make sure new mail keeps arriving. When your mailbox is completely
filled (100%) no new mail will arrive. You can contact us at
[email protected] with your questions.

YourCompany" > $qwf

cat $qwf | /usr/sbin/sendmail -f $FROM_SMTP "$USER"

dovecot_virtual_delivery:
  driver = pipe
  command = /usr/libexec/dovecot/deliver -d $local_part@$domain  -f $sender_address -a $original_local_part@$original_domain
  message_prefix =
  message_suffix =
  delivery_date_add
  envelope_to_add
  return_path_add
  log_output
  user = mail
  temp_errors = 64 : 69 : 70: 71 : 72 : 73 : 74 : 75 : 78

virtual_user:
  driver = accept
  condition = ${perl{save_virtual_user}}
  domains = lsearch;/etc/virtual/domainowners
  group = mail
  retry_use_local_part
  transport = dovecot_virtual_delivery

#!/bin/bash

umask 0077
#env > /tmp/env.log

function error
{
  MSG="To: [email protected]\nSubject: Error in $0\n\nError occured running $0. Error was: $1\n"
  echo -en $MSG | /usr/sbin/sendmail [email protected]
  exit 1
}

[[ "$quota" == "" ]] && error "quota"
[[ "$username" == "" ]] && error "username"
[[ "$domain" == "" ]] && error "domain"
[[ "$user" == "" ]] && error "user"

newquota=$((quota*1024*1024))

MAILDIR=/home/$username/imap/$domain/$user/Maildir
FILE=$MAILDIR/maildirsize
mkdir -p $MAILDIR
echo "${newquota}S,0C" > $FILE
chown -R $username:mail $MAILDIR || error "chown"
chmod 660 $FILE || error "chmod"

exit 0

#!/bin/bash

env 0077
#env > /tmp/env.log

function error
{
  MSG="To: [email protected]\nSubject: Error in $0\n\nError occured running $0. Error was: $1\n"
  echo -en $MSG | /usr/sbin/sendmail [email protected]
  exit 1
}

[[ "$quota" == "" ]] && error "quota"
[[ "$username" == "" ]] && error "username"
[[ "$domain" == "" ]] && error "domain"
[[ "$user" == "" ]] && error "user"
[[ "$newuser" == "" ]] && error "newuser"

newquota=$((quota*1024*1024))
MAILDIR="/home/$username/imap/$domain/$user/Maildir"
FILE="$MAILDIR/maildirsize"
NEWMAILDIR="/home/$username/imap/$domain/$newuser/Maildir"
NEWFILE="$NEWMAILDIR/maildirsize"

[[ -d "${NEWMAILDIR}" ]] || error "maildir"

echo "${newquota}S,0C" > $NEWFILE
# Force quota recalculation
echo "-1024 -1" >> $NEWFILE
chown $username:mail $NEWFILE || error "chown"

exit 0

#!/bin/sh

umask 0077
#env > /tmp/env.log

function error
{
  MSG="To: [email][email protected][/email]\nSubject: Error in $0\n\nError occured running $0. Error was: $1\n"
  echo -en $MSG | /usr/sbin/sendmail [email][email protected][/email]
  exit 1
}

[[ "$quota" == "" ]] && error "quota"
[[ "$username" == "" ]] && error "username"
[[ "$domain" == "" ]] && error "domain"
[[ "$user" == "" ]] && error "user"

MAILDIR=/home/$username/imap/$domain/$user/Maildir
FILE=$MAILDIR/maildirsize
mkdir -p $MAILDIR
echo "${newquota}S,0C" > $FILE
chown -R $username:mail $MAILDIR || error "chown"


exit 0