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nano /etc/dovecot/dovecot.conf

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# Listen addresses.
#   - '*' means all available IPv4 addresses.
#   - '[::]' means all available IPv6 addresses.
# Listen on all available addresses by default
listen = *

#base_dir = /var/run/dovecot
mail_plugins = quota

# Enabled mail protocols.
protocols = pop3 imap sieve

# User/group who owns the message files:
mail_uid = 2000
mail_gid = 2000

# Assign uid to virtual users.
first_valid_uid = 2000
last_valid_uid = 2000

# Logging. Reference: http://wiki2.dovecot.org/Logging
log_path = /var/log/dovecot.log
mail_debug = no
auth_verbose = no
auth_debug = no
auth_debug_passwords = no
# Possible values: no, plain, sha1.
auth_verbose_passwords = no

# SSL: Global settings.
# Refer to wiki site for per protocol, ip, server name SSL settings:
# http://wiki2.dovecot.org/SSL/DovecotConfiguration
ssl = yes
verbose_ssl = no
#ssl_ca =</path/to/ca
ssl_cert = </etc/ssl/certs/iRedMail_CA.pem
ssl_key = </etc/ssl/private/iRedMail.key

# With disable_plaintext_auth=yes AND ssl=required, STARTTLS is mandatory.
# Set disable_plaintext_auth=no AND ssl=yes to allow plain password transmitted
# insecurely.
disable_plaintext_auth = no
# Allow plain text password per IP address/net
#remote 192.168.0.0/24 {
#   disable_plaintext_auth = no
#}

# Mail location and mailbox format.
mail_location = maildir:/%Lh/Maildir/:INDEX=/%Lh/Maildir/

# Authentication related settings.
# Append this domain name if client gives empty realm.
auth_default_realm =

# Authentication mechanisms.
auth_mechanisms = PLAIN LOGIN

# Limits the number of users that can be logging in at the same time.
# Default is 100.
# Note: this value can be overrided by "process_limit =" in service
#       protocol. e.g.
#       protocol imap-login {
#           process_limit = 500
#       }
#default_process_limit = 100

service auth {
     unix_listener /var/spool/postfix/dovecot-auth {
         user = postfix
         group = postfix
         mode = 0666
     }
     unix_listener auth-master {
         user = vmail
         group = vmail
         mode = 0666
     }
     unix_listener auth-userdb {
         user = vmail
         group = vmail
         mode = 0660
     }
}

# Virtual mail accounts.
userdb {
     args = /etc/dovecot/dovecot-ldap.conf
     driver = ldap
}
passdb {
     args = /etc/dovecot/dovecot-ldap.conf
     driver = ldap
}

# Master user.
# Master users are able to log in as other users. It's also possible to
# directly log in as any user using a master password, although this isn't
# recommended.
# Reference: http://wiki2.dovecot.org/Authentication/MasterUsers
auth_master_user_separator = *
passdb {
     driver = passwd-file
     args = /etc/dovecot/dovecot-master-users-password
     master = yes
}

plugin {
     auth_socket_path = /var/run/dovecot/auth-master

     quota = dict:user::proxy::quotadict
     quota_rule = *:storage=1G
     #quota_rule2 = *:messages=0
     #quota_rule3 = Trash:storage=1G
     #quota_rule4 = Junk:ignore

     # Quota warning.
     # If user suddenly receives a huge mail and the quota jumps from
     # 85% to 95%, only the 95% script is executed.
     quota_warning = storage=85%% quota-warning 85 %u
     quota_warning2 = storage=90%% quota-warning 90 %u
     quota_warning3 = storage=95%% quota-warning 95 %u

     # Plugin: autocreate. Create and subscribe to default IMAP folders.
     autocreate = INBOX
     autocreate2 = Sent
     autocreate3 = Trash
     autocreate4 = Drafts
     autocreate5 = Junk
     autosubscribe = INBOX
     autosubscribe2 = Sent
     autosubscribe3 = Trash
     autosubscribe4 = Drafts
     autosubscribe5 = Junk

     # Plugin: expire.
     #expire = Trash 7 Trash/* 7 Junk 30
     #expire_dict = proxy::expire

     # ACL and share folder
     acl = vfile
     acl_shared_dict = proxy::acl

     # By default Dovecot doesn't allow using the IMAP "anyone" or
     # "authenticated" identifier, because it would be an easy way to spam
     # other users in the system. If you wish to allow it,
     #acl_anyone = allow

     # Pigeonhole managesieve service.
     # Reference: http://wiki2.dovecot.org/Pigeonhole/Sieve/Configuration
     # Per-user sieve settings.
     sieve_dir = /%Lh/sieve
     sieve = /%Lh/sieve/dovecot.sieve

     # Global sieve settings.
     sieve_global_dir = /var/vmail/sieve
     sieve_global_path = /var/vmail/sieve/dovecot.sieve
     #sieve_before =
     #sieve_after =

     # The maximum number of redirect actions that can be performed during a
     # single script execution. The meaning of 0 differs based on your version.
     # For versions v0.3.0 and beyond this means that redirect is prohibited.
     # For older versions, however, this means that the number of redirects is
     # unlimited, so be careful.
     #sieve_max_redirects = 4
}

service quota-warning {
     executable = script /usr/local/bin/dovecot-quota-warning.sh
     unix_listener quota-warning {
         user = vmail
         group = vmail
         mode = 0660
     }
}

service dict {
     unix_listener dict {
         mode = 0660
         user = vmail
         group = vmail
     }
}

dict {
     #expire = db:/var/lib/dovecot/expire/expire.db
     quotadict = mysql:/etc/dovecot/dovecot-used-quota.conf
     acl = mysql:/etc/dovecot/dovecot-share-folder.conf
}

protocol lda {
     # Reference: http://wiki2.dovecot.org/LDA
     mail_plugins = $mail_plugins sieve autocreate
     auth_socket_path = /var/run/dovecot/auth-master
     log_path = /var/log/sieve.log
     lda_mailbox_autocreate = yes
     postmaster_address = root
}
protocol imap {
     mail_plugins = $mail_plugins imap_quota autocreate
     imap_client_workarounds = tb-extra-mailbox-sep

     # Maximum number of IMAP connections allowed for a user from each IP address.
     # NOTE: The username is compared case-sensitively.
     # Default is 10.
     # Increase it to avoid issue like below:
     # "Maximum number of concurrent IMAP connections exceeded"
     #mail_max_userip_connections = 20
}
protocol pop3 {
     mail_plugins = $mail_plugins
     pop3_client_workarounds = outlook-no-nuls oe-ns-eoh
     pop3_uidl_format = %08Xu%08Xv

     # Maximum number of IMAP connections allowed for a user from each IP address.
     # NOTE: The username is compared case-sensitively.
     # Default is 10.
     #mail_max_userip_connections = 20
}

# Login processes. Refer to Dovecot wiki for more details:
# http://wiki2.dovecot.org/LoginProcess
service imap-login {
     service_count = 1

     # To avoid startup latency for new client connections, set process_min_avail
     # to higher than zero. That many idling processes are always kept around
     # waiting for new connections.
     #process_min_avail = 0

     # Process limit.
     # Increase it if you got similar error message in Dovecot log file:
     #
     # "master: Warning: service(imap-login): process_limit (100) reached,
     # client connections are being dropped"
     #
     #process_limit = $default_process_limit
     process_limit = 500

     # vsz_limit should be fine at its default 64MB value
     #vsz_limit = 64M
}
service pop3-login {
     service_count = 1
}

namespace {
     type = private
     separator = /
     prefix =
     #location defaults to mail_location.
     inbox = yes
}

namespace {
     type = shared
     separator = /
     prefix = Shared/%%u/
     location = maildir:/%%Lh/Maildir/:INDEX=/%%Lh/Maildir/Shared/%%u
     # this namespace should handle its own subscriptions or not.
     subscriptions = yes
     list = children
}

# Public mailboxes.
# Refer to Dovecot wiki page for more details:
# http://wiki2.dovecot.org/SharedMailboxes/Public
#namespace {
#    type = public
#    separator = /
#    prefix = Public/
#
#    # CONTROL=: Mark this public folder as read-only mailbox
#    # INDEX=: Per-user \Seen flag
#    location = maildir:/var/vmail/public/:CONTROL=~/Maildir/public:INDEX=~/Maildir/public
#
#    # Allow users to subscribe to the public folders.
#    subscriptions = yes
#}