Peter
Here is the log:
2018-04-14 12:04:59 CLIENT -> SERVER: EHLO www.la-union.net
2018-04-14 12:05:00 CLIENT -> SERVER: STARTTLS
2018-04-14 12:05:00 CLIENT -> SERVER: EHLO www.la-union.net
2018-04-14 12:05:00 CLIENT -> SERVER: AUTH CRAM-MD5
2018-04-14 12:05:00 CLIENT -> SERVER: aW5mb0BsYS11bmlvbi5uZXQgYjFmMzBhYTE0ZjVmOGIxNmM3OThmZTgyZGM4M2U3NDA=
2018-04-14 12:05:00 CLIENT -> SERVER: MAIL FROM:<root@localhost>
2018-04-14 12:05:00 CLIENT -> SERVER: RCPT TO:<webmaster@aie-eindhoven.nl>
2018-04-14 12:05:00 CLIENT -> SERVER: DATA
2018-04-14 12:05:00 CLIENT -> SERVER: Date: Sat, 14 Apr 2018 12:04:59 +0000
2018-04-14 12:05:00 CLIENT -> SERVER: To: webmaster@aie-eindhoven.nl
2018-04-14 12:05:00 CLIENT -> SERVER: From: Root User <root@localhost>
2018-04-14 12:05:00 CLIENT -> SERVER: Subject: sfghdfghfgh
2018-04-14 12:05:00 CLIENT -> SERVER: Message-ID: <fc54685f486b8d235a3b002b7ce1880a@www.la-union.net>
2018-04-14 12:05:00 CLIENT -> SERVER: X-Mailer: PHPMailer 5.2.26 (https://github.com/PHPMailer/PHPMailer)
2018-04-14 12:05:00 CLIENT -> SERVER: MIME-Version: 1.0
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Type: multipart/alternative;
2018-04-14 12:05:00 CLIENT -> SERVER: boundary="b1_fc54685f486b8d235a3b002b7ce1880a"
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: This is a multi-part message in MIME format.
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: --b1_fc54685f486b8d235a3b002b7ce1880a
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Type: text/plain; charset=utf-8
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: Contactar el Webmaster
2018-04-14 12:05:00 CLIENT -> SERVER: Nombre:hfff
2018-04-14 12:05:00 CLIENT -> SERVER: Correo electrónico:kjghgh
2018-04-14 12:05:00 CLIENT -> SERVER: Teléfono:05450454
2018-04-14 12:05:00 CLIENT -> SERVER: Asunto:sfghdfghfgh
2018-04-14 12:05:00 CLIENT -> SERVER: Mensaje:dgfhdfghdfgh
2018-04-14 12:05:00 CLIENT -> SERVER: Anexo:
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: IP: 178.249.155.130
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: --b1_fc54685f486b8d235a3b002b7ce1880a
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Type: text/html; charset=utf-8
2018-04-14 12:05:00 CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: <table>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td><h1><strong>Contactar el Webmaster</strong></h1></td><td></td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Nombre:</td><td>hfff</td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Correo electrónico:</td><td>kjghgh</td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Teléfono:</td><td>05450454</td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Asunto:</td><td>sfghdfghfgh</td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Mensaje:</td><td>dgfhdfghdfgh</td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <tr><td>Anexo:</td><td></td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: <td></td></tr>
2018-04-14 12:05:00 CLIENT -> SERVER: </table><br /><br />IP: 178.249.155.130
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: --b1_fc54685f486b8d235a3b002b7ce1880a--
2018-04-14 12:05:00 CLIENT -> SERVER:
2018-04-14 12:05:00 CLIENT -> SERVER: .
2018-04-14 12:05:00 CLIENT -> SERVER: QUIT