Dovecot - SpamToJunk, ImapIDLE and Expunge Junk Folder

Hi,

there are some useful functions that can be implemented in i-MSCP directly

Spam To Junk

The i-MSCP panel already have a spam to junk implementation, but it works only if the user at the first time make a login through webmail and save the custom settings in RoundCube. To make working a default spam-to-junk filter to the users that does not make a login in webmail, here is the solution.

1) edit the /etc/dovecot/dovecot.conf file and add the following lines:

Quote

plugin {
# Begin Plugin::RoundcubePlugin::managesieve::1st
sieve = ~/dovecot.sieve
sieve_default = /var/lib/dovecot/sieve/default.sieve
sieve_dir = ~/sieve
sieve_global_dir = /var/lib/dovecot/sieve/
# Ending Plugin::RoundcubePlugin::managesieve::1st
quota = maildir:User quota
quota_rule = *:storage=1GB
quota_warning = storage=95%% quota-warning 95 %u
quota_warning2 = storage=80%% quota-warning 80 %u
}

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exit and save

2) Create the default sieve dir, create a default sieve rule in and own it to the mail user

mkdir /var/lib/dovecot/sieve
nano /var/lib/dovecot/sieve/default.sieve

Quote

require ["fileinto"];
# rule:[Spam]
if header :contains "X-Spam-Flag" "YES"
{
fileinto "INBOX.Junk";
stop;
}

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chown -R vmail:mail /var/lib/dovecot/sieve

3) reload/restart dovecot service

service dovecot restart

Source: https://rtcamp.com/tutorials/mail/server/sieve-filtering/

Imap IDLE

The Imap IDLE function is very useful to increase the battery life of mobile device. Many Imap clients, like K9 mail, implement a push-to-mail function in Imap that use the Idle function of Imap server. The default idle time in dovecot is set to 2 minutes, increasing this time to 29 minutes, as the rfc2177 say, many mobile device can improve the battery life

edit the /etc/dovecot/dovecot.conf file and add the following line:

Quote

# Protocols

!include_try /usr/share/dovecot/protocols.d/*.protocol

imap_idle_notify_interval = 29 mins

protocol imap {
mail_plugins = $mail_plugins imap_quota
}

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reload/restart dovecot service

service dovecot restart

Source: https://peterkieser.com/2011/0…e-and-dovecots-push-imap/

Expunge Junk Folder

This function can delete the oldest spam email received and optimize the space assigned to the mail account (edit 12/11/2014: modified cronjob and search query in DB)

1) edit the file /etc/dovecot/dovecot-sql.conf and add this line at the end

Quote

iterate_query = SELECT mail_addr AS user FROM mail_users

now restart/reload dovecot service

2) Create a new cronjob like this:

crontab -e

Quote

40 3 12 * * /usr/bin/doveadm expunge -A mailbox INBOX.Junk savedbefore 30d >/dev/null 2>&1

Source: http://wiki2.dovecot.org/Plugins/Expire

Hope this can help many users

Bye bye

Hi,

yes, i confirm, the sieverules are already implemented in i-MSCP through Roundcube managesieve plugins, but the spam to junk function is not enabled by default if the user does not make a login in RoundCube. The result is that the spam email are delivered in INBOX folder and not in INBOX.Junk. With my mod all the users have the spam to junk by default. See a description in 90-sieve.conf file

Quote

##
## Settings for the Sieve interpreter
##

# Do not forget to enable the Sieve plugin in 15-lda.conf and 20-lmtp.conf
# by adding it to the respective mail_plugins= settings.

plugin {
# The path to the user's main active script. If ManageSieve is used, this the
# location of the symbolic link controlled by ManageSieve.
sieve = ~/.dovecot.sieve

# The default Sieve script when the user has none. This is a path to a global
# sieve script file, which gets executed ONLY if user's private Sieve script
# doesn't exist. Be sure to pre-compile this script manually using the sievec
# command line tool.
# --> See sieve_before fore executing scripts before the user's personal
# script.
#sieve_default = /var/lib/dovecot/sieve/default.sieve

# Directory for :personal include scripts for the include extension. This
# is also where the ManageSieve service stores the user's scripts.
sieve_dir = ~/sieve

# Directory for :global include scripts for the include extension.
#sieve_global_dir =

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Sure, i've used exactly your template

The roundcube plugin with your implementation add this in /var/mail/virtual/somedomain/someuser

dovecot.sieve -> sieve/managesieve.sieve
sieve/

But have you try if you don't use roundcube but only IMAP or POP3?

This file/folder are not created and sieve does not have any rule to delivery the spam to INBOX.Junk folder, so, the email are delivered in INBOX with the spam definition directly

For me is not a problem, now the function work correctly as i desire. I've make only 2 installation of i-MSCP in production state (1 in juni and 1 in september), i've followed the wiki for the installation and both have this problem that i've solved with this workaround.

Edited first post at Expunge Junk Folder section