Exclude libmail-dkim-perl if spamassassin will not be installed

install/vst-install-debian.sh

@@ -556,6 +556,7 @@ if [ "$clamd" = 'no' ]; then
 fi
 if [ "$spamd" = 'no' ]; then
     software=$(echo "$software" | sed -e "s/spamassassin//")
+    software=$(echo "$software" | sed -e "s/libmail-dkim-perl//")
 fi
 if [ "$dovecot" = 'no' ]; then
     software=$(echo "$software" | sed -e "s/dovecot-imapd//")