diff --git a/network/serialmail/README b/network/serialmail/README
new file mode 100644
index 0000000000..afd32a03bc
--- /dev/null
+++ b/network/serialmail/README
@@ -0,0 +1,12 @@
+serialmail (pass mail over intermittent links)
+
+NB: serialmail is only useful if you are running the qmail MTA.
+Please check the entry for netqmail before installing serialmail.
+
+serialmail is a collection of tools originally designed for passing
+mail across serial (dialup) links. Nowadays you can use it over
+any intermittently available links, e.g. wifi at a conference.
+serialmail works with qmail: you use qmail to deliver messages to a
+maildir, and then serialmail to deliver messages out of the maildir.
+
+serialmail supports SMTP, including ESMTP PIPELINING, and QMTP.
diff --git a/network/serialmail/README.SBo b/network/serialmail/README.SBo
new file mode 100644
index 0000000000..15532359a0
--- /dev/null
+++ b/network/serialmail/README.SBo
@@ -0,0 +1,4 @@
+See /usr/doc/serialmail-0.75 for configuration instructions. E.g.,
+to configure for sending out mail when wifi is available, read TOISP.
+(Hint: the domain name in the HELO message to the ISP is set in
+ /var/qmail/control/me)
diff --git a/network/serialmail/serialmail-0.75.errno.patch b/network/serialmail/serialmail-0.75.errno.patch
new file mode 100644
index 0000000000..bf01d1b6f6
--- /dev/null
+++ b/network/serialmail/serialmail-0.75.errno.patch
@@ -0,0 +1,23 @@
+diff -u serialmail-0.75.orig/error.h serialmail-0.75/error.h
+--- serialmail-0.75.orig/error.h	1998-11-14 20:28:23.000000000 -0600
++++ serialmail-0.75/error.h	2004-01-29 11:15:32.000000000 -0600
+@@ -1,7 +1,7 @@
+ #ifndef ERROR_H
+ #define ERROR_H
+ 
+-extern int errno;
++#include <errno.h>
+ 
+ extern int error_intr;
+ extern int error_nomem;
+diff -u serialmail-0.75.orig/leapsecs_read.c serialmail-0.75/leapsecs_read.c
+--- serialmail-0.75.orig/leapsecs_read.c	1998-11-14 20:28:23.000000000 -0600
++++ serialmail-0.75/leapsecs_read.c	2004-01-29 11:20:09.000000000 -0600
+@@ -2,7 +2,6 @@
+ #include <sys/stat.h>
+ #include <fcntl.h>
+ #include <errno.h>
+-extern int errno;
+ #include "tai.h"
+ #include "leapsecs.h"
+ 
diff --git a/network/serialmail/serialmail.SlackBuild b/network/serialmail/serialmail.SlackBuild
new file mode 100644
index 0000000000..93d262d431
--- /dev/null
+++ b/network/serialmail/serialmail.SlackBuild
@@ -0,0 +1,118 @@
+#!/bin/sh
+
+# Slackware build script for serialmail
+
+# Copyright 2017 Duncan Roe, Melbourne, Australia
+# All rights reserved.
+#
+# Redistribution and use of this script, with or without modification, is
+# permitted provided that the following conditions are met:
+#
+# 1. Redistributions of this script must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
+#  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+#  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO
+#  EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+#  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+PRGNAM=serialmail
+VERSION=${VERSION:-0.75}
+BUILD=${BUILD:-1}
+TAG=${TAG:-_SBo}
+
+if [ -z "$ARCH" ]; then
+  case "$( uname -m )" in
+    i?86) ARCH=i586 ;;
+    arm*) ARCH=arm ;;
+       *) ARCH=$( uname -m ) ;;
+  esac
+fi
+
+CWD=$(pwd)
+TMP=${TMP:-/tmp/SBo}
+PKG=$TMP/package-$PRGNAM
+OUTPUT=${OUTPUT:-/tmp}
+CHROOT=$TMP/$PRGNAM
+VERBOSE_ADDCHROOT=${VERBOSE_ADDCHROOT:-yes}
+export VERBOSE_ADDCHROOT
+
+# Get alias user and group for /usr/bin/maildirserial setuid.
+# These are the user and group ids allocated by SBo
+NOFILES_GROUP=${NOFILES_GROUP:-340}
+ALIAS_USER=${ALIAS_USER:-339}
+
+# If the user or group is already configured, use that id instead
+grep -q ^nofiles: /etc/group &&
+  NOFILES_GROUP=$(grep ^nofiles: /etc/group|cut -f3 -d:)
+grep -q ^alias: /etc/passwd &&
+  ALIAS_USER=$(grep ^alias: /etc/passwd|cut -f3 -d:)
+
+set -e
+
+rm -rf $PKG $CHROOT
+mkdir -p $TMP $PKG $OUTPUT $CHROOT
+cd $CHROOT
+rm -rf $PRGNAM-$VERSION
+tar xvf $CWD/$PRGNAM-$VERSION.tar.gz
+cd $PRGNAM-$VERSION
+chown -R root:root .
+find -L . \
+ \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
+  -o -perm 511 \) -exec chmod 755 {} \; -o \
+ \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+
+for i in $CWD/*.patch
+do
+  cat $i|patch -p1
+done
+
+echo /usr > conf-home
+make
+
+# You have to do this next bit via chroot.
+# Unlike with ucspi-tcp, it doesn't work to "echo $PKG/usr >conf-home":
+# the pathnames in some of the scripts come out wrong
+
+cd $CHROOT
+mkchroot .
+
+# need make
+addchroot . make guile gc libffi libunistring
+
+# Run the chroot commands
+chroot . /bin/sh -c "cd /$PRGNAM-$VERSION; make setup check"
+
+mkdir -p $PKG/usr/{bin,man/man1,doc}
+for i in serialqmtp serialsmtp maildirqmtp maildirsmtp maildirserial setlock
+do
+  mv usr/bin/$i $PKG/usr/bin/
+  mv usr/man/man1/$i.1 $PKG/usr/man/man1
+done
+
+find $PKG -print0 | xargs -0 file | grep -e "executable" -e "shared object" | grep ELF \
+  | cut -f 1 -d : | xargs strip --strip-unneeded 2> /dev/null || true
+
+find $PKG/usr/man -type f -exec gzip -9 {} \;
+for i in $( find $PKG/usr/man -type l ) ; do ln -s $( readlink $i ).gz $i.gz ; rm $i ; done
+
+chown $ALIAS_USER:$NOFILES_GROUP $PKG/usr/bin/maildirserial
+chmod u+s $PKG/usr/bin/maildirserial
+
+mv usr/doc/$PRGNAM $PKG/usr/doc/$PRGNAM-$VERSION
+chmod g-s $PKG/usr/doc/$PRGNAM-$VERSION
+cp -a $CWD/README.SBo $PKG/usr/doc/$PRGNAM-$VERSION
+cat $CWD/$PRGNAM.SlackBuild > $PKG/usr/doc/$PRGNAM-$VERSION/$PRGNAM.SlackBuild
+
+mkdir -p $PKG/install
+cat $CWD/slack-desc > $PKG/install/slack-desc
+
+cd $PKG
+/sbin/makepkg -l y -c n $OUTPUT/$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.${PKGTYPE:-tgz}
diff --git a/network/serialmail/serialmail.info b/network/serialmail/serialmail.info
new file mode 100644
index 0000000000..5280049bef
--- /dev/null
+++ b/network/serialmail/serialmail.info
@@ -0,0 +1,10 @@
+PRGNAM="serialmail"
+VERSION="0.75"
+HOMEPAGE="http://cr.yp.to/serialmail.html"
+DOWNLOAD="http://cr.yp.to/software/serialmail-0.75.tar.gz"
+MD5SUM="e6a3049863ae8577b1780fcd9fbc98a9"
+DOWNLOAD_x86_64=""
+MD5SUM_x86_64=""
+REQUIRES="mkchroot"
+MAINTAINER="Duncan Roe"
+EMAIL="duncan_roe@optusnet.com.au"
diff --git a/network/serialmail/slack-desc b/network/serialmail/slack-desc
new file mode 100644
index 0000000000..0466662418
--- /dev/null
+++ b/network/serialmail/slack-desc
@@ -0,0 +1,19 @@
+# HOW TO EDIT THIS FILE:
+# The "handy ruler" below makes it easier to edit a package description.
+# Line up the first '|' above the ':' following the base package name, and
+# the '|' on the right side marks the last column you can put a character in.
+# You must make exactly 11 lines for the formatting to be correct.  It's also
+# customary to leave one space after the ':' except on otherwise blank lines.
+
+          |-----handy-ruler------------------------------------------------------|
+serialmail: serialmail (pass mail over intermittent links)
+serialmail:
+serialmail: serialmail is a collection of tools originally designed for passing
+serialmail: mail across serial (dialup) links. Nowadays you can use it over
+serialmail: intermittently available wifi, e.g. at a conference.
+serialmail: serialmail works with qmail: you use qmail to deliver messages to a
+serialmail: maildir, and then serialmail to deliver messages out of the maildir.
+serialmail:
+serialmail: serialmail supports SMTP, including ESMTP PIPELINING, and QMTP.
+serialmail:
+serialmail: Home page: http://cr.yp.to/serialmail.html