diff --git a/do-backup b/do-backup
index 61487b2..4851024 100755
--- a/do-backup
+++ b/do-backup
@@ -3,6 +3,8 @@
 # Copyright (c) 2023:
 #   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
 # Licensed under the terms of the GNU General Public License version 3.
+#
+# Perform backup tasks in a generic way.
 
 # Base configuration.
 BACKUP_MOUNTPOINT="/localdata"
@@ -72,8 +74,8 @@ source /etc/mail.conf "backups" 2>/dev/null || {
 
 # Make sure BACKUP_MOUNTPOINT is a mountpoint.
 mountpoint "$BACKUP_MOUNTPOINT" >/dev/null 2>&1 || {
-  CONFIG_FILE="backups" /opt/bin/pushover -T "Backup" -p '-1' -m "Failure: $RSYNC_SOURCE"
-  mailx "${MAILX_ARGS[@]}" -S "from='$EMAIL_FROM'" -s "Backup failure: $RSYNC_SOURCE" "${EMAIL_TO[@]}" <<-EOF
+  [[ -x "/opt/bin/pushover" ]] && CONFIG_FILE="backups" /opt/bin/pushover -T "Backup" -p '-1' -m "Failure: $RSYNC_SOURCE"
+  [[ -n "${EMAIL_TO[*]}" ]] && mailx "${MAILX_ARGS[@]}" -S "from='$EMAIL_FROM'" -s "Backup failure: $RSYNC_SOURCE" "${EMAIL_TO[@]}" <<-EOF
 	'$BACKUP_MOUNTPOINT' is not a mountpoint.
 	EOF
   exit 1
@@ -85,8 +87,8 @@ ERR="$?"
 
 # Send a notification and mail a log if there were errors.
 (( ERR != 0 )) && (( ERR != 10 ))  && (( ERR != 24 )) && {
-  CONFIG_FILE="backups" /opt/bin/pushover -T "Backup" -p '-1' -m "Failure: $RSYNC_SOURCE"
-  mailx "${MAILX_ARGS[@]}" -S "from='$EMAIL_FROM'" -s "Backup failure: $RSYNC_SOURCE" "${EMAIL_TO[@]}" <<-EOF
+  [[ -x "/opt/bin/pushover" ]] && CONFIG_FILE="backups" /opt/bin/pushover -T "Backup" -p '-1' -m "Failure: $RSYNC_SOURCE"
+  [[ -n "${EMAIL_TO[*]}" ]] && mailx "${MAILX_ARGS[@]}" -S "from='$EMAIL_FROM'" -s "Backup failure: $RSYNC_SOURCE" "${EMAIL_TO[@]}" <<-EOF
 	Exit code: $ERR
 	Output:
 	$(< "$RSYNC_LOG")
diff --git a/dovecot-service-checksuspended b/dovecot-service-checksuspended
index cd9181f..2af1775 100755
--- a/dovecot-service-checksuspended
+++ b/dovecot-service-checksuspended
@@ -1,5 +1,5 @@
 #!/bin/bash
-# Version: 0.0.1
+# Version: 0.1.0
 # Copyright (c) 2023:
 #   Darren 'Tadgy' Austin <darren (at) afterdark.org.uk>
 # Licensed under the terms of the GNU General Public License version 3.