diff -pur mantis-1.1.1.orig/config_defaults_inc.php mantis-1.1.1.octo/config_defaults_inc.php
--- mantis-1.1.1.orig/config_defaults_inc.php	2008-01-16 23:16:24.000000000 +0100
+++ mantis-1.1.1.octo/config_defaults_inc.php	2008-03-30 17:59:44.000000000 +0200
@@ -306,6 +306,7 @@
 
 	# This specifies the access level that is needed to get the mailto: links.
 	$g_show_user_email_threshold = NOBODY;
+	$g_mailto_markup_threshold = NOBODY;
 
 	# If use_x_priority is set to ON, what should the value be?
 	# Urgent = 1, Not Urgent = 5, Disable = 0
diff -pur mantis-1.1.1.orig/core/string_api.php mantis-1.1.1.octo/core/string_api.php
--- mantis-1.1.1.orig/core/string_api.php	2007-12-10 01:22:38.000000000 +0100
+++ mantis-1.1.1.octo/core/string_api.php	2008-03-30 18:15:04.000000000 +0200
@@ -399,9 +399,17 @@
 			ini_set( 'magic_quotes_sybase', true );
 		}
 
-		$p_string = preg_replace( '/\b' . email_regex_simple() . '\b/i',
-								'<a href="mailto:\0">\0</a>',
-								$p_string);
+		if ( access_has_project_level( config_get( 'mailto_markup_threshold' ) ) ) {
+			$p_string = preg_replace( '/\b' . email_regex_simple() . '\b/i',
+									'<a href="mailto:\0">\0</a>',
+									$p_string);
+		} else {
+			$t_random = rand ();
+			$p_string = preg_replace( '/\b' . email_regex_simple() . '\b/i',
+									"\\2@<span style=\"display: none;\">nospam$t_random.</span>\\3",
+									$p_string);
+		}
+
 
 		return $p_string;
 	}