Laravel 5.8 SMTP Mail Sending Not Working

My Laravel 5.8 is always giving this error

Expected response code 354 but got code "554", with message "554 5.5.1 Error: no valid recipients\r\n

I have found this message content is generated

Message-ID: <40e964c6528c7ece80bcc182263806e0@127.0.0.1>
Date: Fri, 28 Jun 2019 19:37:23 +0000
Subject: Reset Password Notification
From: Test <test@test.com>
To: user@gmail.com
MIME-Version: 1.0
Content-Type: multipart/alternative;
 boundary="_=_swift_1561750643_60482b477e4f08f4c29e9e4da779fd64_=_"


--_=_swift_1561750643_60482b477e4f08f4c29e9e4da779fd64_=_
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable

[Laravel](http://localhost)

# Hello!

You are receiving this email=
 because we received a password reset request for your account.

This = password reset link will expire in 60 minutes.

via Chebli Mohamed