Unable to parse SMTPUTF8 emails from EmailConverter

[mnmallea]

Hi!
I'm trying to parse some emails that contain unescaped characters in the email headers. For example:

MIME-Version: 1.0
Message-ID: <1234@mail.gmail.com>
Subject: test
From: Test <tester@test.com.com>
To: Martín Mallea <martín@receiver.com>
Content-Type: multipart/alternative; boundary="0000000000004b527e05dbff4a78"

--0000000000004b527e05dbff4a78
Content-Type: text/plain; charset="UTF-8"

This is a test: ñ

--0000000000004b527e05dbff4a78
Content-Type: text/html; charset="UTF-8"

<div dir="ltr">This is a test: ñ</div>

--0000000000004b527e05dbff4a78--

After trying to parse it using EmailConverter#emlToEmail(InputStream inputStream) the characters in the From address don't get parsed properly.
This is usually fixed by setting the mail.mime.allowutf8 property to true. Unfortunately this is not posible now since the parser is using this createDummySession method:

	private static Session createDummySession() {
		return Session.getInstance(new Properties());
	}

This is not letting me override the properties that the session is using. Do you think that the we could have a way in which I can set the converter to use my own session? Or maybe taking the properties from system properties like this Session.getInstance(new Properties(System.getProperties())) so I can override them?