diff --git a/phpBB/includes/acp/acp_email.php b/phpBB/includes/acp/acp_email.php
index 133fe47e09..e98b7a19a5 100644
--- a/phpBB/includes/acp/acp_email.php
+++ b/phpBB/includes/acp/acp_email.php
@@ -136,8 +136,9 @@ class acp_email
 
 				$i = $j = 0;
 
-				// Send with BCC, no more than 50 recipients for one mail (to not exceed the limit)
-				$max_chunk_size = 50;
+				// Send with BCC
+				// Maximum number of bcc recipients
+				$max_chunk_size = (int) $config['email_max_chunk_size'];
 				$email_list = array();
 				$old_lang = $row['user_lang'];
 				$old_notify_type = $row['user_notify_type'];
diff --git a/phpBB/install/database_update.php b/phpBB/install/database_update.php
index a167e79308..21246a215e 100644
--- a/phpBB/install/database_update.php
+++ b/phpBB/install/database_update.php
@@ -1994,6 +1994,11 @@ function change_database_data(&$no_updates, $version)
 		// No changes from 3.0.9-RC4 to 3.0.9
 		case '3.0.9-RC4':
 		break;
+
+		// Changes from 3.0.9 to 3.0.10-RC1
+		case '3.0.9':
+			set_config('email_max_chunk_size', '50');
+		break;
 	}
 }