From: Alex Dehnert <alex@dehnerts.com>
Date: Sun, 10 Jul 2022 17:54:47 +0000 (-0400)
Subject: Add POP3 support for GMail syncing
X-Git-Url: https://dehnerts.com/gitweb/?a=commitdiff_plain;p=sysconfig%2Fdovecot.git

Add POP3 support for GMail syncing
---

diff --git a/conf.d/20-pop3.conf b/conf.d/20-pop3.conf
new file mode 100644
index 0000000..e0ba552
--- /dev/null
+++ b/conf.d/20-pop3.conf
@@ -0,0 +1,99 @@
+##
+## POP3 specific settings
+##
+
+# 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
+
+# Allow only one POP3 session to run simultaneously for the same user.
+#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
+
+# This option changes POP3 behavior so that it's not possible to actually
+# delete mails via POP3, only hide them from future POP3 sessions. The mails
+# will still be counted towards user's quota until actually deleted via IMAP.
+# Use e.g. "$POP3Deleted" as the value (it will be visible as IMAP keyword).
+# Make sure you can legally archive mails before enabling this setting.
+#pop3_deleted_flag =
+
+# 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
+#  %{deleted_bytes} - number of bytes in 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
+
+# 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 = 
+
+protocol pop3 {
+  # Space separated list of plugins to load (default is global mail_plugins).
+  #mail_plugins = $mail_plugins
+
+  # 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
+}