From: Christian Heller <c.heller@plomlompom.de>
Date: Sun, 16 Dec 2018 00:19:38 +0000 (+0100)
Subject: Add POP3 account fetching to mail server setup.
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Add POP3 account fetching to mail server setup.
---

diff --git a/all_new_2018/linkable_etc_files/mail/etc/systemd/system/fetchmail.service b/all_new_2018/linkable_etc_files/mail/etc/systemd/system/fetchmail.service
new file mode 100644
index 0000000..bd6792d
--- /dev/null
+++ b/all_new_2018/linkable_etc_files/mail/etc/systemd/system/fetchmail.service
@@ -0,0 +1,7 @@
+[Unit]
+Description=Run plom's fetchmail
+
+[Service]
+Type=oneshot
+User=plom
+ExecStart=/bin/sh -c 'fetchmail'
diff --git a/all_new_2018/linkable_etc_files/mail/etc/systemd/system/timers.target.wants/fetchmail.timer b/all_new_2018/linkable_etc_files/mail/etc/systemd/system/timers.target.wants/fetchmail.timer
new file mode 100644
index 0000000..c67e8e7
--- /dev/null
+++ b/all_new_2018/linkable_etc_files/mail/etc/systemd/system/timers.target.wants/fetchmail.timer
@@ -0,0 +1,8 @@
+[Unit]
+Description=Run fetchmail once every minute
+
+[Timer]
+OnCalendar=*-*-* *:*:00
+
+[Install]
+WantedBy=timers.target
diff --git a/all_new_2018/setup_scripts/setup_mail.sh b/all_new_2018/setup_scripts/setup_mail.sh
index c8d4254..7b256b7 100755
--- a/all_new_2018/setup_scripts/setup_mail.sh
+++ b/all_new_2018/setup_scripts/setup_mail.sh
@@ -64,6 +64,20 @@ echo "${mail_domain}" > /etc/mailname
 # allow for sophisticated stuff like dovecot-side sieve filtering (installed
 # with dovecot-sieve).
 apt install -y -o Dpkg::Options::=--force-confold postfix dovecot-imapd dovecot-lmtpd dovecot-sieve opendkim
+cp "${config_tree_prefix}/user_files/dovecot.sieve" /home/plom/.dovecot.sieve
+chown plom:plom /home/plom/.dovecot.sieve
+
+# In addition to our postfix server receiving mails, we funnel mails from a
+# POP3 account into dovecot via fetchmail. It might make sense to adapt the
+# ~/.dovecot.sieve to move mails targeted to the fetched mail account to their
+# own mbox.
+apt install -y fetchmail
+cp "${config_tree_prefix}/user_files/fetchmailrc" /home/plom/.fetchmailrc
+chown plom:plom /home/plom/.fetchmailrc
+systemctl daemon-reload
+systemctl start fetchmail.timer
+
+# Final advice to user.
 echo "TODO: Ensure MX entry for your system in your DNS configuration."
 echo "TODO: Ensure a proper SPF entry for this system in your DNS configuration; something like 'v=spf1 mx -all' mapped to your host."
 if [ "${add_dkim_record}" -eq "1" ]; then
@@ -71,3 +85,4 @@ if [ "${add_dkim_record}" -eq "1" ]; then
     cat "${dkim_selector}.txt"
 fi
 echo "TODO: passwd plom"
+echo "TODO: adapt /home/plom/.dovecot.sieve and /home/plom/.fetchmailrc"
diff --git a/all_new_2018/user_files/dovecot.sieve b/all_new_2018/user_files/dovecot.sieve
new file mode 100644
index 0000000..5346309
--- /dev/null
+++ b/all_new_2018/user_files/dovecot.sieve
@@ -0,0 +1,8 @@
+require ["fileinto"];
+require ["mailbox"];
+if address :is "from" "foo@bar.com" {
+  fileinto :create "foo";
+}
+if address :is :domain "to" "example.com" {
+  fileinto :create "example.com";
+}
diff --git a/all_new_2018/user_files/fetchmailrc b/all_new_2018/user_files/fetchmailrc
new file mode 100644
index 0000000..b437563
--- /dev/null
+++ b/all_new_2018/user_files/fetchmailrc
@@ -0,0 +1,2 @@
+# remove "keep" if you're sure about your setup; it keeps mails on server from getting deleted 
+poll mail.example.com protocol pop3 username "foo@example.com" password "PASSWORD" ssl keep