Ada Apa di Balik Header Email

Mungkin kita udah gak asing lagi dengan imel, dan setiap kita menerima imel, biasanya judul imel (subject), identitas pengirim dan tanggal pengirimannya tertera di bagian header imel seperti yang tampak di bawah ini:

header yang biasa kita lihat

tapi sebenarnya informasi yang ada di header bukan cuma itu, ini dia contoh header yang lengkap:

header lengkap
header lengkap

Header di atas adalah header yang ditampilkan oleh Mozilla Thunderbird kalo opsi View–>Header–>All diaktifkan.

Kalo mau contoh yang lebih ekstrem lagi, coba lihat teks di bawah ini. Teks ini adalah semua informasi yang terkandung dalam imel, dari mulai header, body ampe attachment. Teks ini bisa ditampilkan pake fasilitas View Message Source (Ctrl + U) yang ada di Mozilla Thunderbird Portable:

From – Wed Apr 15 15:35:38 2009
X-Account-Key: account2
X-UIDL: GmailId120a3291670c20c2
X-Mozilla-Status: 0001
X-Mozilla-Status2: 10000000
X-Mozilla-Keys:
Delivered-To: wahyu85@gmail.com
Received: by 10.141.193.16 with SMTP id v16cs214559rvp;
Mon, 13 Apr 2009 22:46:02 -0700 (PDT)
Received: by 10.224.45.210 with SMTP id g18mr6964616qaf.171.1239687961095;
Mon, 13 Apr 2009 22:46:01 -0700 (PDT)
Return-Path: <si_wahyu@yahoo.com>
Received: from web65405.mail.ac4.yahoo.com (web65405.mail.ac4.yahoo.com [76.13.9.25])
by mx.google.com with SMTP id 41si5003443qyk.134.2009.04.13.22.45.59;
Mon, 13 Apr 2009 22:46:00 -0700 (PDT)
Received-SPF: pass (google.com: domain of si_wahyu@yahoo.com designates 76.13.9.25 as permitted sender) client-ip=76.13.9.25;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of si_wahyu@yahoo.com designates 76.13.9.25 as permitted sender) smtp.mail=si_wahyu@yahoo.com; dkim=pass (test mode) header.i=@yahoo.com
Received: (qmail 98851 invoked by uid 60001); 14 Apr 2009 05:45:59 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1239687958; bh=4B1j9aOKDpf18F5kH+xKjva3HKunWYIkWmWtLMHLz2M=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=PajHWZNTXcB8O+RjrziOZ2EHp5v24Vo1KqReLp3FDLaKFrBMOIpcpsu57p8qBsxRZv/F+ezigKnGwBhKtAo9Uv19vrGvOrKJv7GwE6EC4G7Bur3cs6aq5nDxdmiyj2FIULXKJsTpIzI/PXvTCzsBhX7pXerKGmBgZnr6WqiUrAI=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
s=s1024; d=yahoo.com;
h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type;
b=1+gKyPFRZssAHbF72YAZGAc/MhQH29dGcz2BxiipL7QoWRfuV6DBrdsykd3HkqCuzTtQmgn0G4BGMcWhMAG9aPU4wnucoVziuLbt1N9iDMxWCOT+0lGNzHMX7HNNESIovV0W3AeWczhEI9a6WssP4YTQULXz6Fnv0uP9Z0k4B58=;
Message-ID: <992383.97480.qm@web65405.mail.ac4.yahoo.com>
X-YMail-OSG: fWrQUOwVM1nudIPp92K8yhGyVII9R8Mov6LfJF8.jn1gZJ2yeDSgOdwetHy27u34rZ06n_Jt3S.LWumiTwP3hYaacCvbREYXm3i1R299sHtpo6evLgOTDHmFtFfwkFtULd9rECVAgwQhiIDiWE1JWn63w1ZZVT3p6wyNiKtwUQmYpsRJr_TN_8ZTHP3lmFpLVn3iptDLnpDi_QB4ye608adwcDwqpRv_VoEq5MX8Fh25diAaUjjJ2gGaJ0tXXQGIREwPOwpDIV5UjUSjFKDmBT9cqc9VEwatiKiwEi_d3vwTENxAsDII9xN0
Received: from [85.214.22.104] by web65405.mail.ac4.yahoo.com via HTTP; Mon, 13 Apr 2009 22:45:58 PDT
X-Mailer: YahooMailWebService/0.7.289.10
Date: Mon, 13 Apr 2009 22:45:58 -0700 (PDT)
From: Wahyu Hidayat <si_wahyu@yahoo.com>
Subject: email
To: wahyu85@gmail.com
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary=”0-481970050-1239687958=:97480″

–0-481970050-1239687958=:97480
Content-Type: multipart/alternative; boundary=”0-1954142732-1239687958=:97480″

–0-1954142732-1239687958=:97480
Content-Type: text/plain; charset=us-ascii

ini isi emailnya

–0-1954142732-1239687958=:97480
Content-Type: text/html; charset=us-ascii

<table cellspacing=”0″ cellpadding=”0″ border=”0″ ><tr><td valign=”top” style=”font: inherit;”>ini isi emailnya<br></td></tr></table><br>

–0-1954142732-1239687958=:97480–
–0-481970050-1239687958=:97480
Content-Type: text/plain; name=”attach one.txt”
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=”attach one.txt”

aW5pIGF0dGFjaG1lbnQgcGVydGFtYSAtb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1vT28tLW9Pby0tb09vLS1v
T28tLW9Pby0tb09vLS1vT28t

–0-481970050-1239687958=:97480
Content-Type: text/plain; name=”attach two.txt”
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename=”attach two.txt”
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–0-481970050-1239687958=:97480–

Panjang ya? padahal ini cuman imel yang super singkat dengan 2 buah attachment berupa file teks yang juga sangat singkat…

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