default configs for ubuntu releases

install/ubuntu/18.04/dovecot/conf.d/10-auth.conf

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+disable_plaintext_auth = no
+auth_verbose = yes
+auth_mechanisms = plain login
+!include auth-passwdfile.conf.ext

install/ubuntu/18.04/dovecot/conf.d/10-logging.conf

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+log_path = /var/log/dovecot.log

install/ubuntu/18.04/dovecot/conf.d/10-mail.conf

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+mail_privileged_group = mail
+mail_access_groups = mail
+mail_location = maildir:%h/mail/%d/%n
+pop3_uidl_format = %08Xu%08Xv

install/ubuntu/18.04/dovecot/conf.d/10-master.conf

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+service imap-login {
+  inet_listener imap {
+  }
+  inet_listener imaps {
+  }
+}
+
+service pop3-login {
+  inet_listener pop3 {
+  }
+  inet_listener pop3s {
+  }
+}
+
+
+service imap {
+}
+
+service pop3 {
+}
+
+service auth {
+  unix_listener auth-client {
+    group = mail
+    mode = 0660
+    user = dovecot
+  }
+  user = dovecot
+}

install/ubuntu/18.04/dovecot/conf.d/10-ssl.conf

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+ssl = yes
+ssl_protocols = !SSLv2 !SSLv3
+
+ssl_cert = </usr/local/vesta/ssl/certificate.crt
+ssl_key = </usr/local/vesta/ssl/certificate.key

install/ubuntu/18.04/dovecot/conf.d/20-imap.conf

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+##
+## IMAP specific settings
+##
+
+protocol imap {
+  # Maximum IMAP command line length. Some clients generate very long command
+  # lines with huge mailboxes, so you may need to raise this if you get
+  # "Too long argument" or "IMAP command line too large" errors often.
+  #imap_max_line_length = 64k
+
+  # Maximum number of IMAP connections allowed for a user from each IP address.
+  # NOTE: The username is compared case-sensitively.
+  #mail_max_userip_connections = 10
+
+  # Space separated list of plugins to load (default is global mail_plugins).
+  #mail_plugins = $mail_plugins
+
+  # IMAP logout format string:
+  #  %i - total number of bytes read from client
+  #  %o - total number of bytes sent to client
+  #imap_logout_format = bytes=%i/%o
+
+  # Override the IMAP CAPABILITY response. If the value begins with '+',
+  # add the given capabilities on top of the defaults (e.g. +XFOO XBAR).
+  #imap_capability = 
+
+  # How long to wait between "OK Still here" notifications when client is
+  # IDLEing.
+  #imap_idle_notify_interval = 2 mins
+
+  # ID field names and values to send to clients. Using * as the value makes
+  # Dovecot use the default value. The following fields have default values
+  # currently: name, version, os, os-version, support-url, support-email.
+  #imap_id_send = 
+
+  # ID fields sent by client to log. * means everything.
+  #imap_id_log =
+
+  # Workarounds for various client bugs:
+  #   delay-newmail:
+  #     Send EXISTS/RECENT new mail notifications only when replying to NOOP
+  #     and CHECK commands. Some clients ignore them otherwise, for example OSX
+  #     Mail (<v2.1). Outlook Express breaks more badly though, without this it
+  #     may show user "Message no longer in server" errors. Note that OE6 still
+  #     breaks even with this workaround if synchronization is set to
+  #     "Headers Only".
+  #   tb-extra-mailbox-sep:
+  #     Thunderbird gets somehow confused with LAYOUT=fs (mbox and dbox) and
+  #     adds extra '/' suffixes to mailbox names. This option causes Dovecot to
+  #     ignore the extra '/' instead of treating it as invalid mailbox name.
+  #   tb-lsub-flags:
+  #     Show \Noselect flags for LSUB replies with LAYOUT=fs (e.g. mbox).
+  #     This makes Thunderbird realize they aren't selectable and show them
+  #     greyed out, instead of only later giving "not selectable" popup error.
+  #
+  # The list is space-separated.
+  #imap_client_workarounds = 
+}

install/ubuntu/18.04/dovecot/conf.d/20-pop3.conf

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+##
+## POP3 specific settings
+##
+
+protocol pop3 {
+  # Don't try to set mails non-recent or seen with POP3 sessions. This is
+  # mostly intended to reduce disk I/O. With maildir it doesn't move files
+  # from new/ to cur/, with mbox it doesn't write Status-header.
+  #pop3_no_flag_updates = no
+
+  # Support LAST command which exists in old POP3 specs, but has been removed
+  # from new ones. Some clients still wish to use this though. Enabling this
+  # makes RSET command clear all \Seen flags from messages.
+  #pop3_enable_last = no
+
+  # If mail has X-UIDL header, use it as the mail's UIDL.
+  #pop3_reuse_xuidl = no
+
+  # Keep the mailbox locked for the entire POP3 session.
+  #pop3_lock_session = no
+
+  # POP3 requires message sizes to be listed as if they had CR+LF linefeeds.
+  # Many POP3 servers violate this by returning the sizes with LF linefeeds,
+  # because it's faster to get. When this setting is enabled, Dovecot still
+  # tries to do the right thing first, but if that requires opening the
+  # message, it fallbacks to the easier (but incorrect) size.
+  #pop3_fast_size_lookups = no
+
+  # POP3 UIDL (unique mail identifier) format to use. You can use following
+  # variables, along with the variable modifiers described in
+  # doc/wiki/Variables.txt (e.g. %Uf for the filename in uppercase)
+  #
+  #  %v - Mailbox's IMAP UIDVALIDITY
+  #  %u - Mail's IMAP UID
+  #  %m - MD5 sum of the mailbox headers in hex (mbox only)
+  #  %f - filename (maildir only)
+  #  %g - Mail's GUID
+  #
+  # If you want UIDL compatibility with other POP3 servers, use:
+  #  UW's ipop3d         : %08Xv%08Xu
+  #  Courier             : %f or %v-%u (both might be used simultaneosly)
+  #  Cyrus (<= 2.1.3)    : %u
+  #  Cyrus (>= 2.1.4)    : %v.%u
+  #  Dovecot v0.99.x     : %v.%u
+  #  tpop3d              : %Mf
+  #
+  # Note that Outlook 2003 seems to have problems with %v.%u format which was
+  # Dovecot's default, so if you're building a new server it would be a good
+  # idea to change this. %08Xu%08Xv should be pretty fail-safe.
+  #
+  #pop3_uidl_format = %08Xu%08Xv
+
+  # Permanently save UIDLs sent to POP3 clients, so pop3_uidl_format changes
+  # won't change those UIDLs. Currently this works only with Maildir.
+  #pop3_save_uidl = no
+
+  # What to do about duplicate UIDLs if they exist?
+  #   allow: Show duplicates to clients.
+  #   rename: Append a temporary -2, -3, etc. counter after the UIDL.
+  #pop3_uidl_duplicates = allow
+
+  # POP3 logout format string:
+  #  %i - total number of bytes read from client
+  #  %o - total number of bytes sent to client
+  #  %t - number of TOP commands
+  #  %p - number of bytes sent to client as a result of TOP command
+  #  %r - number of RETR commands
+  #  %b - number of bytes sent to client as a result of RETR command
+  #  %d - number of deleted messages
+  #  %m - number of messages (before deletion)
+  #  %s - mailbox size in bytes (before deletion)
+  #  %u - old/new UIDL hash. may help finding out if UIDLs changed unexpectedly
+  #pop3_logout_format = top=%t/%p, retr=%r/%b, del=%d/%m, size=%s
+
+  # Maximum number of POP3 connections allowed for a user from each IP address.
+  # NOTE: The username is compared case-sensitively.
+  #mail_max_userip_connections = 10
+
+  # Space separated list of plugins to load (default is global mail_plugins).
+  #mail_plugins = $mail_plugins
+
+  # Workarounds for various client bugs:
+  #   outlook-no-nuls:
+  #     Outlook and Outlook Express hang if mails contain NUL characters.
+  #     This setting replaces them with 0x80 character.
+  #   oe-ns-eoh:
+  #     Outlook Express and Netscape Mail breaks if end of headers-line is
+  #     missing. This option simply sends it if it's missing.
+  # The list is space-separated.
+  #pop3_client_workarounds = 
+}

install/ubuntu/18.04/dovecot/conf.d/auth-passwdfile.conf.ext

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+passdb {
+  driver = passwd-file
+  args = scheme=MD5-CRYPT username_format=%n /etc/exim4/domains/%d/passwd
+}
+
+userdb {
+  driver = passwd-file
+  args = username_format=%n /etc/exim4/domains/%d/passwd
+}

install/ubuntu/18.04/dovecot/dovecot.conf

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+protocols = imap pop3
+listen = *, ::
+base_dir = /var/run/dovecot/
+!include conf.d/*.conf
+
+namespace {
+    type = private
+    separator = /
+    prefix =
+    inbox = yes
+
+    mailbox Sent {
+        auto = subscribe
+        special_use = \Sent
+    }
+    mailbox Drafts {
+        auto = subscribe
+        special_use = \Drafts
+    }
+    mailbox Trash {
+        auto = subscribe
+        special_use = \Trash
+    }
+}