diff --git a/source/msmtp/.gitignore b/source/msmtp/.gitignore
new file mode 100644
index 0000000..9881fec
--- /dev/null
+++ b/source/msmtp/.gitignore
@@ -0,0 +1 @@
+*.tar.*
diff --git a/source/msmtp/default/msmtpd.new b/source/msmtp/default/msmtpd.new
new file mode 100644
index 0000000..015c4f6
--- /dev/null
+++ b/source/msmtp/default/msmtpd.new
@@ -0,0 +1,7 @@
+# These are the common settings used in rc.d scripts, but there may be more per script:
+#   SERVICE_ENVIRONMENT=()	# Extra environment passed to $SERVICE_EXEC.  Must be an array.
+#   SERVICE_EXTRA_ARGS=()	# Extra arguments passed to $SERVICE_EXEC.  Must be an array.
+#   DAEMON_ENVIRONMENT=()	# Extra environment passed to $DAEMON_EXEC.  Must be an array.
+#   DAEMON_EXTRA_ARGS=()	# Extra arguments passed to $DAEMON_EXEC.  Must be an array.
+#   SLAY_DELAY=""		# Delay between the SIGTERM and SIGKILL on a 'stop'.  Default: 2s.
+#   RESTART_DELAY=""		# Delay between stopping and starting on a 'restart'.  Default: 2s.
diff --git a/source/msmtp/doinst.sh b/source/msmtp/doinst.sh
new file mode 100644
index 0000000..bb45e54
--- /dev/null
+++ b/source/msmtp/doinst.sh
@@ -0,0 +1,53 @@
+# Version: 0.3.5
+# Copyright (c) 2005-2022:
+#   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
+# Licensed under the terms of the GNU General Public License version 3.
+
+install_file() {
+  # $1 = Path of file to process (without leading /, with .new extension)
+
+  [[ -z "$1" ]] || [[ ! -e "$1" ]] && return
+  local OLDFILE="${1%.new}"
+
+  if [[ ! -e "$OLDFILE" ]]; then
+    mv "$1" "$OLDFILE"
+  elif [[ -L "$OLDFILE" ]]; then
+    #     |--------|-----------------------------------------------------------|
+    echo "WARNING: $OLDFILE"
+    echo "         is a symbolic link - the incoming .new file was not written"
+    echo "         to it in order to prevent clobbering something important."
+    echo
+  elif [[ "$(md5sum <"$OLDFILE")" == "$(md5sum <"$1")" ]]; then
+    rm -f "$1"
+  else
+    #     |--------|-----------------------------------------------------------|
+    echo "WARNING: $OLDFILE"
+    echo "         has been customised since original installation and was not"
+    echo "         replaced with the incoming .new file."
+    echo
+  fi
+}
+
+# Install new configuration files.
+install_file "etc/default/msmtpd.new"
+
+# List info pages in the directory.
+[[ -x usr/bin/install-info ]] && usr/bin/install-info %BUILD_PREFIX%/info/msmtp.info.gz %BUILD_PREFIX%/info/dir
+
+# Add service start to rc.local
+RC="rc.msmtpd"
+fgrep "/etc/rc.d/$RC" etc/rc.d/rc.local >/dev/null 2>&1 || {
+  echo >>etc/rc.d/rc.local
+  echo "[[ -x /etc/rc.d/$RC ]] /etc/rc.d/$RC start" >>etc/rc.d/rc.local
+}
+
+# Add service shutdown to rc.local_shutdown
+fgrep "/etc/rc.d/$RC" etc/rc.d/rc.local_shutdown >/dev/null 2>&1 || {
+  # If rc.local_shutdown doesn't exist, create it.
+  [[ -e etc/rc.d/rc.local_shutdown ]] || {
+    echo "#!/bin/bash" >etc/rc.d/rc.local_shutdown
+    chmod 755 etc/rc.d/rc.local_shutdown
+  }
+  echo >>etc/rc.d/rc.local_shutdown
+  echo "[[ -x /etc/rc.d/$RC ]] && /etc/rc.d/$RC stop" >>etc/rc.d/rc.local_shutdown
+}
diff --git a/source/msmtp/msmtp.SlackBuild b/source/msmtp/msmtp.SlackBuild
new file mode 100755
index 0000000..86410d9
--- /dev/null
+++ b/source/msmtp/msmtp.SlackBuild
@@ -0,0 +1,353 @@
+#!/bin/bash
+# Version: 0.6.12
+# Copyright (c) 2005-2022:
+#   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
+# Licensed under the terms of the GNU General Public License version 3.
+
+########################################################################
+# None of this section requires editing.                               #
+# Scroll down to the "Begin section that will require editing" marker. #
+########################################################################
+
+# Silence shellcheck.
+# shellcheck disable=SC2015,SC2174
+
+# extglob is required.
+shopt -s extglob
+
+# Functions.
+check_installed() {
+  # $1 = The package name to check is installed.
+
+  [[ -z "$1" ]] && return 1
+  printf "%s\\n" /var/lib/pkgtools/packages/* | grep -P "^/var/lib/pkgtools/packages/\Q$1\E-([^-]*)-([^-]*)-([^-]*)$" >/dev/null 2>&1
+  return $?
+}
+
+die() {
+  # $1 = The message to write to stderr on exit.
+
+  printf "\\033[1;31;40m%s: %s\\033[0;39m\\n" "${0##*/}" "${1:-Abort}" >&2
+  exit 1
+}
+
+# Make sure to be in the build directory.
+# shellcheck disable=SC2164
+cd "$(cd "${BASH_SOURCE[0]%/*}"; pwd -P)"
+
+# Read global buildconf settings.
+# shellcheck disable=SC1091
+[[ -e ../buildconf ]] && {
+  . ../buildconf 2>/dev/null || die "Error sourcing global buildconf"
+}
+
+# Package specific buildconf settings.
+# shellcheck disable=SC2015,SC1090
+[[ -e "./$(basename "${BASH_SOURCE[0]}" .SlackBuild).buildconf" ]] && . "./$(basename "${BASH_SOURCE[0]}" .SlackBuild).buildconf" 2>/dev/null || \
+    die "Error sourcing package buildconf"
+
+# Package storage path.
+# Be safe and leave it in /tmp by default (can be overridden).
+# shellcheck disable=SC2016
+[[ -z "$PKG_STORE" ]] && PKG_STORE='/tmp/pkg-store/$DIST_OS_ID-$DIST_OS_VERSION_ID'
+
+# Package configuration archive path.
+[[ -z "$PKG_CONFIG_ARCHIVE" ]] && PKG_CONFIG_ARCHIVE="/tmp/pkg-config-archive"
+
+# Parse command line options.
+while (( $# > 0 )); do
+  if [[ "$1" =~ ^-(-)?f(orce)?$ ]]; then
+    BUILD_FORCE=1
+  elif [[ "$1" =~ ^-(-)?k(eep-configs)?$ ]]; then
+    BUILD_KEEPCONFIGS=1
+  elif [[ "$1" =~ ^-(-)?n(o-cleanup)?$ ]]; then
+    BUILD_CLEANUP=0
+  elif [[ "$1" =~ ^-(-)?v(ersion)?$ ]]; then
+    printf "%s=\"%s\"\\n" "NAME" "$PKG_NAME"
+    printf "%s=\"%s\"\\n" "VERSION" "$PKG_VERSION"
+    printf "%s=\"%s\"\\n" "BUILD" "$PKG_BUILD$PKG_TAG"
+    exit 0
+  else
+    printf "%s: %s: %s\\n" "${0##*/}" "Invalid option" "$1" >&2
+    printf "%s: %s %s\\n" "Usage" "${0##*/}" "[[[-f|--force] [-k|--keep-configs] [-n|--no-cleanup]]|[-v|--version]]" >&2
+    exit 1
+  fi
+  shift
+done
+
+# Pre-build checks.
+(( ${BUILD_FORCE:-0} != 1 )) && {
+  while read -r PKG; do
+    check_installed "$PKG" && die "Conflicting package installed: $PKG"
+  done < <(printf "%s " "${BUILD_CONFLICTS[@]}")
+  while read -r PKG; do
+    check_installed "$PKG" || die "Required package not installed: $PKG"
+  done < <(printf "%s " "${BUILD_REQUIRES[@]}")
+}
+
+# Gather some system information.
+# shellcheck disable=SC2046
+declare DIST_OS_$(grep "^ID=" /etc/os-release)
+# shellcheck disable=SC2046
+declare DIST_OS_$(grep "^VERSION_ID=" /etc/os-release)
+# Try to detect a 'current' build environment.
+# shellcheck disable=SC2046
+declare DIST_OS_$(grep "^VERSION_CODENAME=" /etc/os-release)
+[[ "$DIST_OS_VERSION_CODENAME" == "current" ]] && DIST_OS_VERSION_ID="current"
+unset DIST_OS_VERSION_CODENAME
+
+# Build environment.
+BUILD_WORKDIR="${BUILD_WORKDIR:-/tmp/pkg-build}"
+BUILD_ROOT="$BUILD_WORKDIR/pkg-$PKG_NAME"
+BUILD_PREFIX="${BUILD_PREFIX:-/opt}"
+BUILD_ALTCC="${BUILD_ALTCC:-}"
+BUILD_ALTCXX="${BUILD_ALTCXX:-}"
+BUILD_NUMJOBS="${BUILD_NUMJOBS:-7}"
+case "${BUILD_ARCH:=$(uname -m)}" in
+  i[45]86)
+    BUILD_CFLAGS="${BUILD_CFLAGS:--march="$BUILD_ARCH" -mtune=i586 -O2}"
+    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
+    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
+    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
+    PKG_ARCH="${PKG_ARCH:-$BUILD_ARCH}"
+    ;;
+  i686)
+    BUILD_CFLAGS="${BUILD_CFLAGS:--march="$BUILD_ARCH" -mtune=pentium4 -O2}"
+    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
+    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
+    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
+    PKG_ARCH="${PKG_ARCH:-$BUILD_ARCH}"
+    ;;
+  x86_64|x86-64)
+    DIST_OS_ID="slackware64"
+    BUILD_CFLAGS="${BUILD_CFLAGS:--march=x86-64-v2 -mtune=ivybridge -O2 -fPIC}"
+    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
+    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
+    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
+    BUILD_LIBDIRSUFFIX="64"
+    PKG_ARCH="${PKG_ARCH:-x86_64}"
+    ;;
+  aarch64)
+    DIST_OS_ID="slackwareaarch64"
+    BUILD_CFLAGS="${BUILD_CFLAGS:-O2 -fPIC}"
+    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
+    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
+    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
+    BUILD_LIBDIRSUFFIX="64"
+    PKG_ARCH="${PKG_ARCH:-aarch64}"
+    ;;
+  arm*)
+    DIST_OS_ID="slackwarearm"
+    BUILD_CFLAGS="${BUILD_CFLAGS:-O2}"
+    BUILD_CXXFLAGS="${BUILD_CXXFLAGS:-$BUILD_CFLAGS}"
+    BUILD_LDFLAGS="${BUILD_LDFLAGS:-}"
+    BUILD_MAKEFLAGS=( "${BUILD_MAKEFLAGS[@]}" )
+    PKG_ARCH="${PKG_ARCH:-arm}"
+    ;;
+  *)
+    die "Unsupported build architecture: $BUILD_ARCH"
+    ;;
+esac
+
+# Now all possible changes to variables in PKG_STORE and PKG_CONFIG_ARCHIVE are complete, expand out the embedded variables.
+eval "$(declare -p PKG_STORE PKG_CONFIG_ARCHIVE | sed -re 's/\\\$/$/g')"
+
+# Sanity.
+SRC_DIR="$(pwd)"
+umask 0022
+[[ ! -e "$BUILD_WORKDIR" ]] && { mkdir -p -m 750 "$BUILD_WORKDIR" || die "Failed to create working directory"; }
+rm -rf "$BUILD_ROOT" && mkdir -m 755 "$BUILD_ROOT" || die "Failed to clear build root"
+[[ -n "${SRC_DIRNAMES[*]}" ]] && { rm -rf "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" || die "Failed to clear source directories"; }
+
+# Get sources if they aren't downloaded already.
+[[ -n "${SRC_DOWNLOADS[*]}" ]] && {
+  WGET="$(command -v wget)"
+  I=0
+  while read -r SRC; do
+    [[ ! -e "${SRC_FILENAMES[I]}" ]] && {
+      [[ -z "$WGET" ]] && die "wget is required to download sources"
+      "$WGET" -t 3 -c -T 30 -w 5 --retry-connrefused --retry-on-host-error --no-check-certificate --passive-ftp -O "${SRC_FILENAMES[I]}" "$SRC" || \
+          { rm "${SRC_FILENAMES[I]}"; die "Failed to download source file: $SRC"; }
+    }
+    [[ "$(md5sum "${SRC_FILENAMES[I]}" | cut -d' ' -f1)" != "${SRC_MD5SUMS[I]}" ]] && die "md5sum verification failed: ${SRC_FILENAMES[I]}"
+    (( I++ ))
+  done < <(printf "%s\\n" "${SRC_DOWNLOADS[@]}")
+}
+
+# Unpack sources.
+[[ -n "${SRC_FILENAMES[*]}" ]] && {
+  while read -r SRC; do
+    case "$SRC" in
+      *.tar.*|*.t?z)
+        tar -xv -C "$BUILD_WORKDIR" -f "$SRC" || die "Failed to extract source: $SRC"
+        ;;
+      *.zip|*.ZIP)
+        unzip -d "$BUILD_WORKDIR" "$SRC" || die "Failed to extract source: $SRC"
+        ;;
+      *)
+        die "Un-handled source archive format: ${SRC##*.}"
+        ;;
+    esac
+  done < <(printf "%s\\n" "${SRC_FILENAMES[@]}")
+}
+
+# Fix any weird permissions on sources.
+[[ -n "${SRC_DIRNAMES[*]}" ]] && { chown -R root:root "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" && chmod -R go-w "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}" || \
+    die "Failed to correct source directory permissions"; }
+
+# Standard ./configure options.
+CONFIGURE_OPTS=("${BUILD_ALTCC:+CC=$BUILD_ALTCC}" "${BUILD_ALTCXX:+CXX=$BUILD_ALTCXX}" "--prefix=$BUILD_PREFIX"
+    "--libdir=$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX" "--sysconfdir=/etc/$PKG_NAME" "--localstatedir=/var" "--mandir=$BUILD_PREFIX/man"
+    "--infodir=$BUILD_PREFIX/info" "--build=$PKG_ARCH-slackware-linux")
+
+# Process each of the sources.
+for ((I = 0; I < ${#SRC_DIRNAMES[@]}; I++)); do
+  # Be in the source directory.
+  cd "$BUILD_WORKDIR/${SRC_DIRNAMES[I]:?Failed to change to source directory}" || die "Failed to change to source directory"
+
+  ############################################
+  # Begin section that will require editing. #
+  ############################################
+
+  # Build each source in the array.
+  case "$I" in
+    0)
+      # Patch before build.
+      # zcat "$SRC_DIR/patches/EDITME.diff.gz" | patch -p0 || die "Source patching failed for: EDITME.diff.gz"
+
+      # Configure.
+      CFLAGS="$BUILD_CFLAGS" CXXFLAGS="$BUILD_CXXFLAGS" LDFLAGS="$BUILD_LDFLAGS" ./configure "${CONFIGURE_OPTS[@]}" \
+          --docdir="$BUILD_PREFIX/doc/${SRC_FILENAMES[I]%.@(tar|tar.*|t?z|zip)}" --with-tls=openssl --with-libidn --without-libsecret || \
+          die "Source ./configure failed: ${SRC_FILENAMES[I]%-*}"
+
+      # Build and install.
+      make -j "$BUILD_NUMJOBS" "${BUILD_MAKEFLAGS[@]}" V=1 && make -j "$BUILD_NUMJOBS" "${BUILD_MAKEFLAGS[@]}" DESTDIR="$BUILD_ROOT" V=1 install || \
+          die "Failed to build and install source: ${SRC_FILENAMES[I]%-*}"
+
+      # Package documentation.
+      mkdir -p -m 755 "$BUILD_ROOT/$BUILD_PREFIX/doc/${SRC_FILENAMES[I]%.@(tar|tar.*|t?z|zip)}" && cp --parents ABOUT-NLS AUTHORS COPYING ChangeLog \
+          ChangeLog.old INSTALL NEWS README THANKS "$BUILD_ROOT/$BUILD_PREFIX/doc/${SRC_FILENAMES[I]%.@(tar|tar.*|t?z|zip)}" || \
+          die "Documentation copy failed: ${SRC_FILENAMES[I]%-*}"
+      ;;
+    *)
+      die "Un-handled source file - no build configuration"
+      ;;
+  esac
+done
+
+# Move the package configuration files into the archive.
+[[ -e "$BUILD_ROOT/etc/$PKG_NAME" ]] && {
+  (( ${BUILD_KEEPCONFIGS:-0} == 0 )) && {
+    rm -rf "$PKG_CONFIG_ARCHIVE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}"
+    mkdir -p -m 755 "$PKG_CONFIG_ARCHIVE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}/etc/$PKG_NAME" || \
+        die "Failed to create directory: $PKG_CONFIG_ARCHIVE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}/etc/$PKG_NAME"
+    mv "$BUILD_ROOT/etc/$PKG_NAME"/* "$PKG_CONFIG_ARCHIVE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}/etc/$PKG_NAME" || \
+        die "Failed to move configuration files to archive"
+  }
+}
+
+# Create the stub config directory.
+mkdir -p "$BUILD_ROOT/etc/$PKG_NAME" || die "Failed to create config directory"
+
+##################################################
+# End of the only section that required editing. #
+##################################################
+
+# Set up for sed replacements.
+SED_OPTS=("-e" "s:%BUILD_PREFIX%:$BUILD_PREFIX:g" "-e" "s:%BUILD_LIBDIR%:$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX:g" "-e" "s:%BUILD_ARCH%:$BUILD_ARCH:g"
+    "-e" "s:%DIST_OS_ID%:$DIST_OS_ID:g" "-e" "s:%DIST_OS_VERSION_ID%:$DIST_OS_VERSION_ID:g" "-e" "s:%PKG_NAME%:$PKG_NAME:g"
+    "-e" "s:%PKG_VERSION%:$PKG_VERSION:g" "-e" "s:%PKG_FILE_VERSION%:${PKG_VERSION//-/_}:g" "-e" "s:%PKG_ARCH%:$PKG_ARCH:g"
+    "-e" "s:%PKG_BUILD%:$PKG_BUILD:g" "-e" "s:%PKG_TAG%:${PKG_TAG//-/_}:g" "-e" "s:%PKG_EXT%:$PKG_EXT:g")
+
+# Add extra configuration/scripts.
+for DIR in cron.d cron.hourly cron.daily cron.weekly cron.monthly default logrotate.d profile.d rc.d; do
+  [[ -e "$SRC_DIR/$DIR" ]] && {
+    mkdir -p -m 755 "$BUILD_ROOT/etc/$DIR" || die "Failed to create directory: /etc/$DIR"
+    for FILE in "$SRC_DIR/$DIR"/*; do
+      sed -r "${SED_OPTS[@]}" <"$FILE" >"$BUILD_ROOT/etc/$DIR/${FILE##*/}" && chmod --reference="$FILE" "$BUILD_ROOT/etc/$DIR/${FILE##*/}" || \
+          die "Failed to copy $DIR/${FILE##*/} into package"
+    done
+  }
+done
+
+# Slackware packages don't ship with hardlinks (I don't know why...).
+HARDLINKS="$(find "$BUILD_ROOT" -type f -links +1 | tr $'\n' ' ')"
+[[ -n "$HARDLINKS" ]] && die "Found hardlinked files in package: $HARDLINKS"
+
+# Strip binaries.
+find "$BUILD_ROOT" -type f -exec file {} + | grep -E "ELF.*(executable|shared object)" | cut -d: -f1 | xargs -r strip --strip-unneeded || \
+    die "Failed to stip object files"
+
+# Move man and info pages if required.
+for DIR in "$BUILD_ROOT/$BUILD_PREFIX/share/man" "$BUILD_ROOT/usr/share/man" "$BUILD_ROOT/$BUILD_PREFIX/share/info" "$BUILD_ROOT/usr/share/info"; do
+  [[ -e "$DIR" ]] && {
+    mkdir -p -m 755 "$BUILD_ROOT/$BUILD_PREFIX/${DIR##*/}" || die "Failed to create $BUILD_PREFIX/${DIR##*/} directory"
+    mv "$DIR"/* "$BUILD_ROOT/$BUILD_PREFIX/${DIR##*/}" && rmdir "$DIR" || die "Failed to move $DIR to correct directory"
+  }
+done
+
+# Handle man pages.
+[[ -e "$BUILD_ROOT/$BUILD_PREFIX/man" ]] && {
+  find "$BUILD_ROOT/$BUILD_PREFIX/man" -regextype posix-extended -type f -regex "^$BUILD_ROOT/$BUILD_PREFIX/man/([^/]*/)?man.*/.*\.[[:digit:]n]{1}[^.]*$" \
+      -exec gzip -9 {} + || die "Failed to compress man pages"
+  find "$BUILD_ROOT/$BUILD_PREFIX/man" -type l -printf 'if [[ -e "%h/%l.gz" ]]; then (cd "%h" && ln -sf "%l.gz" "%f.gz" && rm -f "%f") || \
+      die "Failed to fix symlink: %f"; else die "Dangling symlink: %p"; fi\n' | bash || die "Man pages' symlinks correction failed"
+}
+
+# Compress and fix info pages.
+[[ -e "$BUILD_ROOT/$BUILD_PREFIX/info" ]] && {
+  rm -f "$BUILD_ROOT/$BUILD_PREFIX/info/dir"
+  find "$BUILD_ROOT/$BUILD_PREFIX/info" -regextype posix-extended -type f -regex "^$BUILD_ROOT/$BUILD_PREFIX/info/.*(\.info){1}(-[[:digit:]]+)?$" \
+      -exec gzip -9 {} + || die "Failed to compress info pages"
+  find "$BUILD_ROOT/$BUILD_PREFIX/info" -type l -printf 'if [[ -e "%h/%l.gz" ]]; then (cd "%h" && ln -sf "%l.gz" "%f.gz" && rm -f "%f") || \
+      die "Failed to fix symlink: %f"; else die "Dangling symlink: %p"; fi\n' | bash || die "Info pages' symlink correction failed"
+}
+
+# Fix paths for perl modules.
+[[ -e "$BUILD_ROOT/$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX/perl5" ]] && {
+  find "$BUILD_ROOT/$BUILD_PREFIX/lib$BUILD_LIBDIRSUFFIX/perl5" -name .packlist -exec sed -ri -e "s:^$BUILD_ROOT::g" \
+      -e "s:^($BUILD_PREFIX|/usr){1}/share:$BUILD_PREFIX:g" \
+      -e "s:^$BUILD_PREFIX/man/([^/]*/)?(man.*)/(.*)\.([[:digit:]n]){1}([^.])*$:$BUILD_PREFIX/man/\1\2/\3\.\4\5\.gz:g" \
+      -e "s:^$BUILD_PREFIX/info/(.*)(\.info){1}(-[[:digit:]]+)?$:$BUILD_PREFIX/info/\1\2\3.gz:g" {} + || die "Failed to modify incorrect perl paths"
+  find "$BUILD_ROOT" -name perllocal.pod -exec rm -f {} +		# Should never fail
+  # Note: These will fail if $BUILD_ROOT == /usr, but are required to clean left over directories from perllocal.pod removal.
+  rmdir "$BUILD_ROOT/usr/lib$BUILD_LIBDIRSUFFIX/perl5" 2>/dev/null	# OK to fail
+  rmdir "$BUILD_ROOT/usr/lib$BUILD_LIBDIRSUFFIX" 2>/dev/null		# OK to fail
+  rmdir "$BUILD_ROOT/usr" 2>/dev/null					# OK to fail
+}
+
+# /opt/<package>{,-<version>} is a special case.
+# Technically, the FHS requires everything in /opt to be contained in its own package directory,
+# so - assuming this technicallity is in use - make symlinks into the standard /opt dirs.
+[[ "$BUILD_PREFIX" =~ ^/opt/$PKG_NAME.* ]] && {
+  (cd "$BUILD_ROOT/opt" &&
+   for DIR in bin doc include info lib lib64 libexec man sbin share; do
+     [[ -e "${BUILD_PREFIX##*/}/$DIR" ]] && { mkdir -m 755 "$DIR" && (cd "$DIR" && lndir -silent "../${BUILD_PREFIX##*/}/$DIR)") || exit 1; }
+   done) || die "Failed to link /opt paths"
+}
+
+# Copy pkgtool special files into the package.
+mkdir -m 755 "$BUILD_ROOT/install" || die "Failed to make /install directory"
+for FILE in doinst.sh douninst.sh slack-{conflicts,desc,required,suggests}; do
+  [[ -e "$SRC_DIR/$FILE" ]] && {
+    sed -r -e '/(^#|^$|-handy-ruler-)/ d' "${SED_OPTS[@]}" <"$SRC_DIR/$FILE" >"$BUILD_ROOT/install/$FILE" || \
+        die "Failed to copy in pkgtool special file: $FILE"
+  }
+done
+
+# Build the package.
+cd "$BUILD_ROOT" || die "Failed to cd to BUILD_ROOT to build package"
+rm -f "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}".*
+makepkg -l y -p -c n --acls --xattrs "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT" || \
+    die "Package creation failed"
+
+# Clean up after ourselves.
+(( ${BUILD_CLEANUP:-1} == 1 )) && rm -rf "$BUILD_ROOT" "${SRC_DIRNAMES[@]/#/$BUILD_WORKDIR/}"
+
+# Move package to the store.
+{ mkdir -p -m 755 "$PKG_STORE" && rm -f "$PKG_STORE/$PKG_NAME"* && \
+    mv "$BUILD_WORKDIR/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT" "$PKG_STORE"; } || \
+    die "Failed to move package to store - package left in $BUILD_WORKDIR"
+
+printf "\\033[1;32;40m%s:\\n  %s\\033[0;39m\\n" "Package built and moved to store" \
+    "$PKG_STORE/$PKG_NAME-${PKG_VERSION//-/_}-$PKG_ARCH-$PKG_BUILD${PKG_TAG//-/_}.$PKG_EXT"
diff --git a/source/msmtp/msmtp.buildconf b/source/msmtp/msmtp.buildconf
new file mode 100644
index 0000000..eedabcc
--- /dev/null
+++ b/source/msmtp/msmtp.buildconf
@@ -0,0 +1,16 @@
+# Package details.
+PKG_NAME="$(basename "${BASH_SOURCE[0]}" .buildconf)"
+PKG_VERSION="1.8.22"
+PKG_BUILD="1"
+PKG_TAG="${PKG_TAG:-_tadgy}"
+PKG_EXT="${PKG_EXT:-txz}"
+
+# Sources - the details in these arrays must all match per indicies.
+SRC_DOWNLOADS=("https://marlam.de/msmtp/releases/$PKG_NAME-$PKG_VERSION.tar.xz")
+SRC_MD5SUMS=("8d4ab680f16e9736e24c749015ae858b")
+SRC_FILENAMES=("$PKG_NAME-$PKG_VERSION.tar.xz")
+SRC_DIRNAMES=("$PKG_NAME-$PKG_VERSION")
+
+# Build configuration.
+BUILD_REQUIRES=('libidn' 'libunistring' 'openssl')
+BUILD_CONFLICTS=("$PKG_NAME")
diff --git a/source/msmtp/rc.d/rc.msmtpd b/source/msmtp/rc.d/rc.msmtpd
new file mode 100644
index 0000000..1237c1b
--- /dev/null
+++ b/source/msmtp/rc.d/rc.msmtpd
@@ -0,0 +1,122 @@
+#!/bin/bash
+# Version: 0.4.0-daemon
+# Copyright (c) 2005-2022:
+#   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
+# Licensed under the terms of the GNU General Public License version 3.
+
+SERVICE_EXEC="%BUILD_PREFIX%/bin/msmtpd"
+SERVICE_ARGS=('--log=syslog')
+DAEMON_EXEC="/usr/bin/daemon"
+DAEMON_ARGS=('-N' '-n' "${0##*rc.}" '-r' '-a' '60' '-A' '5' '-L' '3600' '-M' '3' '-l' 'daemon.err' '-b' 'daemon.debug' '-o' 'daemon.info' '--')
+
+# Allow configuration in /etc/default to override.
+# Additional available variables:
+#   SERVICE_ENVIRONMENT=()	# Extra environment passed to $SERVICE_EXEC.  Must be an array.
+#   SERVICE_EXTRA_ARGS=()	# Extra arguments passed to $SERVICE_EXEC.  Must be an array.
+#   DAEMON_ENVIRONMENT=()	# Extra environment passed to $DAEMON_EXEC.  Must be an array.
+#   DAEMON_EXTRA_ARGS=()	# Extra arguments passed to $DAEMON_EXEC.  Must be an array.
+#   SLAY_DELAY=""		# Delay between the SIGTERM and SIGKILL on a 'stop'.  Default: 2s.
+#   RESTART_DELAY=""		# Delay between stopping and starting on a 'restart'.  Default: 2s.
+# shellcheck disable=SC1090
+[[ -e "/etc/default/${0##*rc.}" ]] && { source "/etc/default/${0##*rc.}" || return 1 2>/dev/null || exit 1; }
+
+error() {
+  printf "%s: %s\\n" "${BASH_SOURCE[0]##*/}" "$*" >&2
+}
+
+checkconfigured() {
+  # This function can be used to perform any pre-start tests; hopfully to insure the daemon
+  # can start correctly, before actually trying to start it.  A return value of 0 means the
+  # tests were passed and the daemon should be started.  Any other value prevents the
+  # daemon from being started, and an error message will be emitted.
+  return 0
+}
+
+checkstatus() {
+  if "$DAEMON_EXEC" --running -n "${0##*rc.}"; then
+    printf "%s: %s: %s\\n" "${BASH_SOURCE[0]##*/}" "${SERVICE_EXEC##*/}" "running"
+    return 0
+  else
+    printf "%s: %s: %s\\n" "${BASH_SOURCE[0]##*/}" "${SERVICE_EXEC##*/}" "stopped"
+    return 1
+  fi
+}
+
+startdaemon() {
+  local EXEC
+  for EXEC in "$SERVICE_EXEC" "$DAEMON_EXEC"; do
+    if [[ ! -e "$EXEC" ]]; then
+      error "not found: $EXEC"
+      return 2
+    elif [[ ! -x "$EXEC" ]]; then
+      error "not executable: $EXEC"
+      return 2
+    fi
+  done
+  checkconfigured || {
+    error "not started - pre-start checks failed"
+    return 2
+  }
+  # shellcheck disable=SC2048,SC2046,SC2086
+  ${DAEMON_ENVIRONMENT:+declare ${DAEMON_ENVIRONMENT[*]};} "$DAEMON_EXEC" ${DAEMON_ARGS[*]} ${DAEMON_EXTRA_ARGS[*]} \
+      $(printf -- "-e \"%s\" " "${SERVICE_ENVIRONMENT[@]}") "$SERVICE_EXEC" ${SERVICE_ARGS[*]} ${SERVICE_EXTRA_ARGS[*]}
+  # shellcheck disable=SC2181
+  if (( $? != 0 )); then
+    error "error starting '${DAEMON_EXEC##*/}:'"
+    return 2
+  else
+    return 0
+  fi
+}
+
+stopdaemon() {
+  "$DAEMON_EXEC" -n "${0##*rc.}" --stop 2>/dev/null
+  sleep "${SLAY_DELAY:-2}"
+  checkstatus >/dev/null && {
+    error "failed to stop gracefully - slaying"
+    "$DAEMON_EXEC" -n "${0##*rc.}" --signal=kill 2>/dev/null
+  }
+  return 0
+}
+
+case "$1" in
+  'start')
+    if checkstatus >/dev/null; then
+      error "${SERVICE_EXEC##*/}: already running"
+      printf "  %s\\n" "Try: ${BASH_SOURCE[0]} status" >&2
+      RET=1
+    else
+      startdaemon
+      RET=$?
+    fi
+    ;;
+  'stop')
+    if ! checkstatus >/dev/null; then
+      error "${SERVICE_EXEC##*/}: not running"
+      printf "  %s\\n" "Try: ${BASH_SOURCE[0]} status" >&2
+      RET=1
+    else
+      stopdaemon
+      RET=$?
+    fi
+    ;;
+  'restart')
+    checkstatus >/dev/null
+    (( $? != 3 )) && {
+      stopdaemon >/dev/null 2>&1
+      sleep "${RESTART_DELAY:-2}"
+    }
+    startdaemon
+    RET=$?
+    ;;
+  'status')
+    checkstatus
+    RET=$?
+    ;;
+  *)
+    printf "%s\\n" "Usage: ${BASH_SOURCE[0]} <start|stop|restart|status>" >&2
+    RET=1
+    ;;
+esac
+
+return $RET 2>/dev/null || exit $RET
diff --git a/source/msmtp/slack-conflicts b/source/msmtp/slack-conflicts
new file mode 100644
index 0000000..405c5df
--- /dev/null
+++ b/source/msmtp/slack-conflicts
@@ -0,0 +1,9 @@
+# Version: 0.2.2
+# This is the list of packages which, if installed, will conflict with the
+# package currently being installed.  For example, 'lprng' conflicts with
+# 'cups' as they are both printing systems.
+# Packages must be listed one per line and are case sensitive.  No versioning
+# information should be used.  This file is only used by slapt-get.
+exim
+postfix
+sendmail
diff --git a/source/msmtp/slack-desc b/source/msmtp/slack-desc
new file mode 100644
index 0000000..ac87fbf
--- /dev/null
+++ b/source/msmtp/slack-desc
@@ -0,0 +1,19 @@
+# Version: 0.2.5
+# Package description syntax:
+#  * There must be exactly 11 lines which begin with the package name and ':'.
+#  * Line up the first '|' of the ruler with the ':' following the package name.
+#  * A single space should be left after the ':' before any description text.
+#  * The end '|' of the ruler marks the last columm which should contain text.
+
+          |-----handy-ruler------------------------------------------------------|
+%PKG_NAME%: msmtp (A SMTP client)
+%PKG_NAME%:
+%PKG_NAME%: msmpt is a sendmail compatible "nullmailer" SMTP client.
+%PKG_NAME%: It accepts locally generated email and forwards it onto an ISPs SMTP
+%PKG_NAME%: servers for further delivery.  It does not accept mail or handle local
+%PKG_NAME%: mailboxes.
+%PKG_NAME%:
+%PKG_NAME%:
+%PKG_NAME%: Warning: This package does not contain any configuration files.
+%PKG_NAME%:
+%PKG_NAME%: Packaged by: Darren 'Tadgy' Austin.  Built for: %DIST_OS_ID%-%DIST_OS_VERSION_ID%.
diff --git a/source/msmtp/slack-required b/source/msmtp/slack-required
new file mode 100644
index 0000000..7fb2e5e
--- /dev/null
+++ b/source/msmtp/slack-required
@@ -0,0 +1,15 @@
+# Version: 0.2.3
+# This is the list of packages which, if the package currently being installed
+# is to operate correctly, must be installed on the system - its dependancies.
+# For example, 'spamassassin' requires the 'perl' package to operate.
+# Packages must be listed one per line and are case sensitive.  If multiple
+# packages could satisfy a single dependancy (such as 'openssl-solibs' and
+# 'openssl' for the SSL library) the packages should be listed in the format:
+#  <pkg1> | <pkg2> [| <pkg3> ...]
+# Specific package versions can be specified using  =  >=  =<  <  >  operators.
+# The = operator requires the full package version string (eg, 1.2.3-x86_64-5).
+# The >=  =<  <  > operators, can use the short package version string
+# (eg, 1.2.3) or the full version string.  This file is only used by slapt-get.
+libidn
+libunistring
+openssl | openssl-solibs