+cp "${config_tree_prefix}/user_files/dovecot.sieve" /home/plom/.dovecot.sieve
+chown plom:plom /home/plom/.dovecot.sieve
+
+# Pingmail setup.
+apt install -y mailutils
+cp "${config_tree_prefix}/user_files/pingmailrc" /home/plom/.pingmailrc
+chown plom:plom /home/plom/.pingmailrc
+su plom -c "cd && git clone https://plomlompom.com/repos/clone/pingmail.git"
+
+# 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.
+cp "${config_tree_prefix}/user_files/fetchmailrc" /home/plom/.fetchmailrc
+chown plom:plom /home/plom/.fetchmailrc
+chmod 0700 /home/plom/.fetchmailrc
+
+# Pingmail and fetchmail have some systemd timers waiting. To let systemd
+# know about them, do this.
+systemctl daemon-reload
+
+# Final advice to user.