Fix bug where invalid recipients could be silently discareded (#5739)

CHANGELOG

@@ -1,6 +1,8 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix bug where invalid recipients could be silently discareded (#5739)
+
 RELEASE 1.3-rc
 --------------
 - "Flattened" the larry theme: fresher look by removing shadows and gradients

program/steps/mail/sendmail.inc

@@ -897,9 +897,6 @@ function rcmail_email_input_format($mailto, $count=false, $check=true)
             $result[] = format_email_recipient($address, $name);
             $item     = $address;
         }
-        else if (trim($item)) {
-            continue;
-        }
 
         // check address format
         $item = trim($item, '<>');