To: support@example.com
Subject: Failed Mail
From: Test test@example.com
Content-Type: multipart/mixed; boundary=earendil
Message-Id: 20200123143934.05D7EE792E@example.com
Date: Thu, 23 Jan 2020 15:39:33 +0100 (CET)
MIME-Version: 1.0

--earendil
Content-Disposition: attachment; filename=fax_1234.pdf
Content-Type: application/pdf; name=fax_+491234.pdf
Content-Transfer-Encoding: base64

JVBERi0xLjEgCiXi48/TCjEgMCBvYmoKPDwgCi9UeXBlIC9DYXRhbG9nIAovUGFnZXMgMyAwIFIg
NjYzMzQ4NzM+XQo+PgpzdGFydHhyZWYKNDM4MjAzCiUlRU9GCg==

--earendil
Content-Transfer-Encoding: quoted-printable

Sehr geehrter Kunde,

Sie haben soeben ein neues Fax von +491234, fuer Rufnummer 01234=
7 empfangen.

Empfangszeit: Thursday, January 23 2020, at 03:39 PM
Absender: +491234
Empfaenger: 01234