Fixed sending two to headers when sending email.

[zyronix]

Fixes #751

[zyronix]

Before:

Return-Path: <www-data@localhost.localdomain>
Received: from localhost.localdomain (localhost.localdomain [127.0.0.1])
        by localhost.localdomain (8.15.2/8.15.2/Debian-22) with ESMTP id 24KELPlA017303
        for <root@localhost.localdomain>; Fri, 20 May 2022 14:21:25 GMT
Received: (from www-data@localhost)
        by localhost.localdomain (8.15.2/8.15.2/Submit) id 24KELPkh017302;
        Fri, 20 May 2022 14:21:25 GMT
Date: Fri, 20 May 2022 14:21:25 GMT
Message-Id: <202205201421.24KELPkh017302@localhost.localdomain>
To: root@localhost.localdomain
Subject: Password reset
MIME-Version: 1.0
From: Hashtopolis <hashtopolis@example.org>
To: root@localhost.localdomain
Content-Type: multipart/alternative;boundary=np6287a3e53ff62

After:

Return-Path: <www-data@localhost.localdomain>
Received: from localhost.localdomain (localhost.localdomain [127.0.0.1])
        by localhost.localdomain (8.15.2/8.15.2/Debian-22) with ESMTP id 24KEKghk017155
        for <root@localhost.localdomain>; Fri, 20 May 2022 14:20:42 GMT
Received: (from www-data@localhost)
        by localhost.localdomain (8.15.2/8.15.2/Submit) id 24KEKglD017154;
        Fri, 20 May 2022 14:20:42 GMT
Date: Fri, 20 May 2022 14:20:42 GMT
Message-Id: <202205201420.24KEKglD017154@localhost.localdomain>
To: root@localhost.localdomain
Subject: Password reset
MIME-Version: 1.0
From: Hashtopolis <hashtopolis@example.org>
Content-Type: multipart/alternative;boundary=np6287a3ba03ec7