Sebuah pesan e-mail terdiri dari header, yang berisi informasi tentang pengirim pesan tersebut, penerima pesan tersebut dan route dari pesan tersebut. Selain header pesan e-mail juga terdiri dari sebuah body e-mail, yaitu berisi pesan apapun yang dikirimkan oleh pengirim pesan e-mail. Body e-mail terdiri dari pesan dan biasanya diakhiri oleh signature pengirim e-mail.
Contoh dari struktur email :
Delivered-To: ando.sinaga@gmail.com
Received: by 10.142.217.15 with SMTP id p15cs413498wfg;
Mon, 13 Apr 2009 18:04:10 -0700 (PDT)
Received: by 10.224.54.8 with SMTP id o8mr6857062qag.204.1239671049117;
Mon, 13 Apr 2009 18:04:09 -0700 (PDT)
Return-Path: <xfinity_7967@yahoo.com>
Received: from web53007.mail.re2.yahoo.com (web53007.mail.re2.yahoo.com [206.190.49.37])
by mx.google.com with SMTP id 11si4954533qyk.118.2009.04.13.18.04.07;
Mon, 13 Apr 2009 18:04:08 -0700 (PDT)
Received-SPF: pass (google.com: domain of xfinity_7967@yahoo.com designates 206.190.49.37 as permitted sender) client-ip=206.190.49.37;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of xfinity_7967@yahoo.com designates 206.190.49.37 as permitted sender) smtp.mail=xfinity_7967@yahoo.com; dkim=pass (test mode) header.i=@yahoo.com
Received: (qmail 88698 invoked by uid 60001); 14 Apr 2009 01:04:07 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1239671047; bh=IT3LAPYV5wN84bMFoW1kwrr0HBiJme19XLUhao39NL8=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=KkxpHXhNBgCzMdFtstnYDQru9xR2NSbOQLsImn9ZsjujyAq0R2hU1OvQsg8haxv6vtvuUmXw8d5ZnyGt3NBGVYO/FdGckvqSSRcAREOENP4QGFZ29fpbGk6tEOOaHdjkDU+t63ygth/0CpfJ/aMlMZas/Y7TMUvosr7yqcEHJcg=
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=V0nvsX5K+C1MIAb/5qKEnufH/i8KckYrSoN6ouge9EN7P4enGY0PXA4DGam7yvmZY2eIh3c9RRyqRsF6o6WAAkFif8JrCY1QspTTRMuPnwfbvwa8L2biThraQmzGAjT3/k4ZOK6UTXiUaNrBAdTJa108pIsFuAgXH3l9sbPbRrU=;
Message-ID: <496531.88133.qm@web53007.mail.re2.yahoo.com>
X-YMail-OSG: 7E8U9xkVM1kjOg.J_aMnQzDuUkOyc4QsnKM2ullnRRADr3.pfA15hp_FvIQvoDK1RRWFH6RRkVKOApAjdpISZUEgSw1d4U80dr7WWXkUNJZhJS20UUMaRM3Kl9vefnPw5ikyIxse_9RShbcVELpI6F_BenKExo0HExmYOyM9qjQn4ArlGhhH5MONWRtTdQwX.6jtLhbsrfU26DkdXuVVG7yDTP2NBWGHKGSpFM2NHu2wWFsCNTkOYpv7DnKG8dbCi365fk6egxpMMMM.cKP2VE9Ng6KjB24bpbVyspUOjRT.kwLw0d18malUUb7ZFeGxnZTdzFcPopkpN1U-
Received: from [114.121.7.121] by web53007.mail.re2.yahoo.com via HTTP; Mon, 13 Apr 2009 18:04:07 PDT
X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1
Date: Mon, 13 Apr 2009 18:04:07 -0700 (PDT)
From: Herbert Sinaga <xfinity_7967@yahoo.com>
Subject: Tugas e-mail
To: ando.sinaga@gmail.com
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="0-206848008-1239671047=:88133"
--0-206848008-1239671047=:88133
Content-Type: multipart/alternative; boundary="0-309565483-1239671047=:88133"
--0-309565483-1239671047=:88133
Content-Type: text/plain; charset=us-ascii
Tugas E-Mail Kemananan Sistem Informasi
----------
Herbert BM Sinaga
*an ordinary boy in unordinary world*
--0-309565483-1239671047=:88133
Content-Type: text/html; charset=us-ascii
<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Tugas E-Mail Kemananan Sistem Informasi<br><div> </div>----------<br>Herbert BM Sinaga<br>*an ordinary boy in unordinary world*<div><br></div></div><br>
</body></html>
--0-309565483-1239671047=:88133--
--0-206848008-1239671047=:88133
Content-Type: text/plain; name="willy.txt"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="willy.txt"
DQpTaG93IFJlY2VudCBNZXNzYWdlcyAoRjMpDQoNCndpbGx5YW51Z3JhaGNh
aHlhZGk6IGFwYSB5YS4uLg0Kd2lsbHlhbnVncmFoY2FoeWFkaTogcHVueWEg
ZmlsbSB1bmdndWxhbiBhcGE/DQp3aWxseWFudWdyYWhjYWh5YWRpOiANCndp
bGx5YW51Z3JhaGNhaHlhZGk6IFJvbWFuY2UgYWRhIHlnIGJhZ3VzIGdhayBr
---- cut-----
File lengkap dari struktur email diatas dapat diunduh di sini. Dari file struktur e-mail diatas, suatu pesan e-mail dapat dilihat terdiri dari header dan body.
Delivered-To: ando.sinaga@gmail.com
Received: by 10.142.217.15 with SMTP id p15cs413498wfg;
Mon, 13 Apr 2009 18:04:10 -0700 (PDT)
Received: by 10.224.54.8 with SMTP id o8mr6857062qag.204.1239671049117;
Mon, 13 Apr 2009 18:04:09 -0700 (PDT)
Return-Path: <xfinity_7967@yahoo.com>
Received: from web53007.mail.re2.yahoo.com (web53007.mail.re2.yahoo.com [206.190.49.37])
by mx.google.com with SMTP id 11si4954533qyk.118.2009.04.13.18.04.07;
Mon, 13 Apr 2009 18:04:08 -0700 (PDT)
Received-SPF: pass (google.com: domain of xfinity_7967@yahoo.com designates 206.190.49.37 as permitted sender) client-ip=206.190.49.37;
Authentication-Results: mx.google.com; spf=pass (google.com: domain of xfinity_7967@yahoo.com designates 206.190.49.37 as permitted sender) smtp.mail=xfinity_7967@yahoo.com; dkim=pass (test mode) header.i=@yahoo.com
Received: (qmail 88698 invoked by uid 60001); 14 Apr 2009 01:04:07 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoo.com; s=s1024; t=1239671047; bh=IT3LAPYV5wN84bMFoW1kwrr0HBiJme19XLUhao39NL8=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=KkxpHXhNBgCzMdFtstnYDQru9xR2NSbOQLsImn9ZsjujyAq0R2hU1OvQsg8haxv6vtvuUmXw8d5ZnyGt3NBGVYO/FdGckvqSSRcAREOENP4QGFZ29fpbGk6tEOOaHdjkDU+t63ygth/0CpfJ/aMlMZas/Y7TMUvosr7yqcEHJcg=
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=V0nvsX5K+C1MIAb/5qKEnufH/i8KckYrSoN6ouge9EN7P4enGY0PXA4DGam7yvmZY2eIh3c9RRyqRsF6o6WAAkFif8JrCY1QspTTRMuPnwfbvwa8L2biThraQmzGAjT3/k4ZOK6UTXiUaNrBAdTJa108pIsFuAgXH3l9sbPbRrU=;
Message-ID: <496531.88133.qm@web53007.mail.re2.yahoo.com>
X-YMail-OSG: 7E8U9xkVM1kjOg.J_aMnQzDuUkOyc4QsnKM2ullnRRADr3.pfA15hp_FvIQvoDK1RRWFH6RRkVKOApAjdpISZUEgSw1d4U80dr7WWXkUNJZhJS20UUMaRM3Kl9vefnPw5ikyIxse_9RShbcVELpI6F_BenKExo0HExmYOyM9qjQn4ArlGhhH5MONWRtTdQwX.6jtLhbsrfU26DkdXuVVG7yDTP2NBWGHKGSpFM2NHu2wWFsCNTkOYpv7DnKG8dbCi365fk6egxpMMMM.cKP2VE9Ng6KjB24bpbVyspUOjRT.kwLw0d18malUUb7ZFeGxnZTdzFcPopkpN1U-
Received: from [114.121.7.121] by web53007.mail.re2.yahoo.com via HTTP; Mon, 13 Apr 2009 18:04:07 PDT
X-Mailer: YahooMailRC/1277.35 YahooMailWebService/0.7.289.1
Date: Mon, 13 Apr 2009 18:04:07 -0700 (PDT)
From: Herbert Sinaga <xfinity_7967@yahoo.com>
Subject: Tugas e-mail
To: ando.sinaga@gmail.com
Header terdiri dari beberapa baris yang diawali oleh sebuah keyword diikuti titik dua (:), diikuti oleh informasi dari masing-masing baris. Header dari pesan e-mail terdiri dari beberapa field yang umum yaitu :
Received : menjelaskan route yang diambil oleh pesan email tersebut, sistem apa yang menangani pesan tersebut dan waktu dari pesan tersebut ditangani.
Date : tanggal dan waktu kirim pesan (termasuk zona waktu).
From : pengirim dari pesan, berupa alamat e-mail pengirim.
Sender : pengirim, field ini akan diisi oleh sistem apabila pengirim sebenarnya pesan berbeda dari field From.
To : kepada siapa pesan e-mail ini dikirim.
Cc : alamat atau penerima yang mungkin menerima copy dari pesan.
Subject : subjek dari pesan email.
Message-Id : sistem akan mengenerate Id unik. Field ini berfungsi untuk melakukan tracing apabila beberapa copy pesan diterima.
Reply-To : alamat e-mail untuk melakukan pesan balas (reply). Biasanya diisi secara otomatis oleh sistem.
X-Mailer : semua field yang dimulai dengan huruf X disediakan oleh sistem mail untuk tujuan tertentu.
Sedangkan body e-mail terdiri dari isi pesan e-mail dan signature dari pesan e-mail.
