diff --git a/interface/lib/plugins/mail_user_filter_plugin.inc.php b/interface/lib/plugins/mail_user_filter_plugin.inc.php
index 4f24042b303bca819da67de91ec4ab6c72933b03..cc1d33dbe6995d5ebfeddacc428e0aa0c247159c 100644
--- a/interface/lib/plugins/mail_user_filter_plugin.inc.php
+++ b/interface/lib/plugins/mail_user_filter_plugin.inc.php
@@ -168,20 +168,20 @@ class mail_user_filter_plugin {
 					$searchterm = preg_replace( $patterns, $replace, $page_form->dataRecord["searchterm"] );
 				} else {
 					$sieve_regex_escape = array(
-						'\\' => '\\\\\\',
-						'+' => '\\\\+',
-						'*' => '\\\\*',
-						'?' => '\\\\?',
-						'[' => '\\\\[',
-						'^' => '\\\\^',
-						']' => '\\\\]',
-						'$' => '\\\\$',
-						'(' => '\\\\(',
-						')' => '\\\\)',
-						'{' => '\\\\{',
-						'}' => '\\\\}',
-						'|' => '\\\\|',
-						'.' => '\\\\.',
+                                               '\\' => '\\\\',
+                                               '+' => '\\+',
+                                               '*' => '\\*',
+                                               '?' => '\\?',
+                                               '[' => '\\[',
+                                               '^' => '\\^',
+                                               ']' => '\\]',
+                                               '$' => '\\$',
+                                               '(' => '\\(',
+                                               ')' => '\\)',
+                                               '{' => '\\{',
+                                               '}' => '\\}',
+                                               '|' => '\\|',
+                                               '.' => '\\.',
 						# these (from preg_quote) should not be needed
 						#'=' => '\\\\=',
 						#'!' => '\\\\!',