使用java将电子邮件转换为其原始格式

Question

I tried until now to create an object of type MimeMessage using JavaMail api, and after that to obtain its raw representation, but with no success. The only thing that I could obtain is a raw representation of the content of the email, but the header, subject, or recipients were not included. I am interested in any suggestions, any java libraries, that could help me in creating an email object, and after that obtain its raw representation. The raw representation should look something like this:

received: from imta14.emeryville.ca.mail.myisp.net ([nn.nn.30.46])
by alnrmxc19.isp.net (alnrmxc19) with ESMTP
id <20080930215116a19007q9u6e>; Tue, 30 Sep 2008 21:51:16 +0000
X-Originating-IP: [nn.nn.30.46]
Received: from libertatea.go ([nn.nn.161.160])
by IMTA14.mail.isp.net with isp
id M9qy1a00V3TwUto0E9rELB; Tue, 30 Sep 2008 21:51:15 +0000
X-Authority-Analysis: v=1.0 c=1 a=DZlucjOqAY8A:10 a=mnGO974OAAAA:8
a=9MJFf195B83LjESASTQA:9 a=Lm7NQ261g8eJHgoaELoA:7
a=7Narey355jFQWZRww2lj1r9-lCkA:4 a=8COHQAuY8ZYA:10 a=zEVpGHA-kecA:10
a=37WNUvjkh6kA:10
Received: by libertatea.go id hm1nfa0di0sn for <xxx@myisp.net>; Sun,30 Sep 2018 09:36:35
+0300 (envelope-from <Hometown.Quotes_ary@mousemegadot.com>)
Message-ID: <79864795@mousemegadot.com>
Date: Sun, 30 Sep 2018 09:36:35 +0300
From: "Hometown Quotes" <Hometown.Quotes_ary@mousemegadot.com>
To: dummy@myisp.net
Subject: Find Affordable Auto Insurance Today
MIME-Version: 1.0
X-UID: 79864795.modhnrfo.jhhnk.1
Content-Type: multipart/alternative; boundary="0-1411506895-1200484069=:66653"
Content-Transfer-Encoding: 8bit
X-PMFLAGS: 570966272 9 1 PE71PYHD.CNM 
X-UC-Weight: [# ] 51
X-CC-Diagnostic: Test 'LazyHTML Tolerant' (51)

--0-1411506895-1200484069=:66653
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

--0-1411506895-1200484069=:66653
Content-transfer-encoding: 8bit
Content-Type: text/html; charset=iso-8859-1; DelSp="Yes"; format="flowed"

Answer 1

What you are looking for is MimeMessag#writeTo which outputs the message as an RFC 822 format stream.

An example of using writeTo to convert a MimeMessage to a String.

MimeMessage mimeMessage;

// mimeMessage get assigned

ByteArrayOutputStream output = new ByteArrayOutputStream();
mimeMessage.writeTo(output);
String rawEmail = output.toString();