diff -Nur smeserver-qpsmtpd-2.2.0/root/etc/e-smith/templates/var/service/qpsmtpd/config/plugins/70spamassassin smeserver-qpsmtpd-2.2.0-size_limit/root/etc/e-smith/templates/var/service/qpsmtpd/config/plugins/70spamassassin
--- smeserver-qpsmtpd-2.2.0/root/etc/e-smith/templates/var/service/qpsmtpd/config/plugins/70spamassassin	2013-06-12 12:21:01.070118703 +0200
+++ smeserver-qpsmtpd-2.2.0-size_limit/root/etc/e-smith/templates/var/service/qpsmtpd/config/plugins/70spamassassin	2013-06-12 12:22:57.240817228 +0200
@@ -26,7 +26,8 @@
 	push @options, "munge_subject_threshold", $spamassassin{TagLevel};
     }
 
-    if ($spamassassin{MaxMessageSize} =~ m/^\d+$/)
+    my $size = $spamassassin{MaxMessageSize} || '';
+    if ($size =~ m/^\d+$/)
     {
         push @options, "size_limit", $spamassassin{MaxMessageSize};
     }