diff -urN ../roundcubemail-1.5.0.orig/program/include/rcmail_sendmail.php ./program/include/rcmail_sendmail.php
--- ../roundcubemail-1.5.0.orig/program/include/rcmail_sendmail.php	2021-10-17 23:38:04.000000000 +0300
+++ ./program/include/rcmail_sendmail.php	2021-12-14 15:57:29.030601000 +0200
@@ -772,6 +772,7 @@
                     $name = stripcslashes($name);
                 }
 
+                $address = preg_replace('/>'.mb_chr(0x200B).'$/', '>', $address);
                 $address  = rcube_utils::idn_to_ascii(trim($address, '<>'));
                 $result[] = format_email_recipient($address, $name);
                 $item     = $address;