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/etc/iptables/rules.v4 に pop3 と pop3s を許可するように設定した
実行したコマンド
$ sudo /sbin/iptables-restore --verbose < /etc/iptables/rules.v4

参考にしたページ
Raspberry Pi と iptables - Raspberry Pi を何年か使い続けるブログ

$ sudo apt-get update
$ sudo apt-get upgrade
The following packages have been kept back:
fake-hwclock gnome-accessibility-themes gnome-themes-standard
gnome-themes-standard-data libfm-data libfreetype6
libfreetype6-dev libgail-3-0 libgcc1 libgfortran3 libgomp1 libgtk-3-0 libgtk-3-bin
libgtk-3-common
libjavascriptcoregtk-3.0-0 libpango1.0-0 libstdc++6 libwebkitgtk-3.0-0
lxpanel omxplayer pcmanfm pypy-upstream
zenity zenity-common

The following packages will be upgraded:
apache2 apache2-mpm-worker apache2-utils apache2.2-bin
apache2.2-common base-files bind9 bind9-host bind9utils
bsd-mailx cpio curl dbus dbus-x11 dnsutils dosfstools file
krb5-locales libbind9-80 libc-bin libc-dev-bin libc6
libc6-dev libcurl3 libcurl3-gnutls libdbus-1-3 libdns88 libevent-2.0-5 libflac8
libgssapi-krb5-2 libisc84 libisccc80
libisccfg82 libjasper1 libk5crypto3 libkrb5-3 libkrb5support0 liblwres80
libmagic1 libmysqlclient18 libpixman-1-0
libpq5 libraspberrypi-bin libraspberrypi-dev libraspberrypi-doc libraspberrypi0
libssl1.0.0 libwebkitgtk-3.0-common
libxml2 locales mime-support multiarch-support mysql-common ntp ntpdate
openssl perl perl-base perl-modules
python-rpi.gpio python3-rpi.gpio raspberrypi-artwork raspberrypi-bootloader
raspi-config tzdata unzip xdg-utils
xserver-common xserver-xorg-core
69 upgraded, 0 newly installed, 0 to remove and 24 not upgraded.