我收到大量“从我的服务器发送”的电子邮件127.0.0.1

Question

我怎么知道进程或脚本发送此电子邮件的方式？

我更改了电子邮件帐户，并继续发送消息。

有什么提示吗？

Received: from [127.0.0.1] (port=41196 helo=www.xxxxxx.com.br)
    by host10.xxxxxxx.com.br with esmtp (Exim 4.93)
    (envelope-from <site@xxxxxx.com.br>)
    id 1jZ0iC-009K99-MF
    for mail@demolink.org; Wed, 13 May 2020 20:22:52 -0300
Date: Wed, 13 May 2020 20:22:52 -0300
To: mail@demolink.org
From: Construtora B4 <site@xxxxx.com.br>
Reply-To: ylcbxvgj <s.kreuter@bluewin.ch>
Subject: Construtora B4: NICHT VERPASSEN. Tester gesucht
Message-ID: <344bc10cc4e6106cff787ea3a18be3d9@www.xxxxx.com.br>
X-Priority: 3
X-Mailer: PHPMailer 5.2.9 (https://github.com/PHPMailer/PHPMailer/)
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit