ACP2E-717: Emails are not sent for the email containing ".-"

Author: thiaramus

lib/internal/Magento/Framework/Mail/AddressConverter.php

@@ -60,10 +60,14 @@ private function convertEmailUserToAscii(string $email): string
         if (preg_match('/^(.+)@([^@]+)$/', $email, $matches)) {
             $user = $matches[1];
             $hostname = $matches[2];
-            $userEncoded = idn_to_ascii($user, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46);
+            $userEncoded = idn_to_ascii($user, IDNA_NONTRANSITIONAL_TO_ASCII, INTL_IDNA_VARIANT_UTS46, $idnaInfo);
             if ($userEncoded == $user) {
                 return $email;
             }
+
+            if ($userEncoded === false && array_key_exists('result', $idnaInfo)) {
+                $userEncoded = $idnaInfo['result'];
+            }
             $email = sprintf('%s@%s', $userEncoded, $hostname);
         }
         return $email;