How to create a swiftmailer message and attach it to another message - php

Question

We are using SwiftMailer in one of our functions who sends emails out.
At the end, there is a general report sent to the department manager in order to keep trace and be informed about the function usage.
The manager is now willing to also receive a copy of the email sent out, we could do this by adding one email copy as attachment to the email report.
Any idea on how can we create a swiftmailer message and not sending it, only using it as attachment for a new swiftmailer email.

Answer 1

You could add your Swift_Message as an attachment like this:
$attachment = new \Swift_Attachment($messageAttachment, 'some-email.txt', 'text/plain');
However, your email would be now attached as an .txt file which contains all mail details. I'm not sure if this is the expected behaviour!?
Full example:
$messageAttachment = (new \Swift_Message('Attached Email'))
->setFrom('yourmail#gmail.com')->setTo('yourmail#gmail.com')
->setBody("Attached Email Body", 'text/plain');
$attachment = new \Swift_Attachment($messageAttachment, 'some-email.txt', 'text/plain');
$message = (new \Swift_Message('Real Email'))
->setFrom('yourmail#gmail.com')->setTo('yourmail#gmail.com')
->setBody("Real Email Body", 'text/plain')
->attach($attachment);
$mailer->send($message);
The content of the attached some-email.txt will look like this:
Message-ID: <568d128d97e530d1389cb83b154d64eb#swift.generated>
Date: Tue, 05 Dec 2017 17:00:05 +0100
Subject: Attached Email
From: yourmail#gmail.com
To: yourmail#gmail.com
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Attached Email Body