[KI] Anatomi Surat Elektronik

Jumpa lagi dengan tugas KI. Kali ini mengenai anatomi surat elektronik atau yang biasa dikenal e-mail.

Kirimkan email ke diri sendiri (atau minta orang lain untuk mengirimkan email) dengan dua attachment (yang kecil saja). Identifikasi bagian-bagian di email, mana yang menunjukkan separator (pemisahan) dan mana attachmentnya (dan dikodekan dalam format apa).

Saya pun mengirimkan pesan ke surel (surat elektronik) sendiri.

Pada pengerjaan tugas ini, saya menggunakan surel saya yang gmail karena gmail memiliki fitur untuk melihat pesan asli (show original ).

Ternyata dalam pengiriman pesan ini digunakan protokol MIME (

Multipurpose Internet Mail Extension). Protokol MIME memiliki kelebihan dibandingkan

Protokol SMTP (Simple Mail Transfer Protocol).  Jikalau SMTP hanya  boleh mengandung berkas teks saja (yang dikodekan dengan menggunakan pengodean ASCII 7-bit), MIME mengizinkan beberapa data selain teks , seperti video, suara, dan berkas biner agar dapat ditransfer melalui surel tanpa harus mentranslasi terlebih dahulu data-data tersebut ke dalam teks berformat ASCII.

Meskipun demikian, protokol ini tidaklah dibuat untuk menggantikan protokol SMTP, tapi hanya memperluas pada dua bagian: “multipart message body” dan “non-ASCII message content”.

MIME menambahkan dua jenis header SMTP tambahan, yakni sebagai berikut:

  • Content-Type: menentukan jenis content yang dibawa oleh pesan-pesan SMTP.

Meliputi : text,application, berkas, audio,message,dan multipart.

  • Content-Transfer-Encoding: menentukan metode apa yang digunakan untuk mengodekan pesan-pesan SMTP.

Meliputi  7bit, 8 bit, binary, quited-printable, base64 (UUEncoded data), x-token.

Identifikasi bagian-bagian surel  adalah sebagai berikut :

1. Header

MIME-Version: 1.0
Received: by 10.224.53.204 with HTTP; Mon, 8 Mar 2010 02:29:49 -0800 (PST)
Date: Mon, 8 Mar 2010 17:29:49 +0700
Delivered-To: meliza.766hi@gmail.com
Message-ID: <464981771003080229q7a9e5df6h6333141db00138d@mail.gmail.com>
Subject: Tes Anatomi Surel
From: meliza silalahi <meliza.766hi@gmail.com>
To: meliza silalahi <meliza.766hi@gmail.com>

2. Body

Content-Type: multipart/mixed; boundary=0015175cfa3e7ac2f80481478bea

--0015175cfa3e7ac2f80481478bea
Content-Type: multipart/alternative; boundary=0015175cfa3e7ac2f10481478be8

--0015175cfa3e7ac2f10481478be8
Content-Type: text/plain; charset=ISO-8859-1

Salam,

Tes tes tes
tes anatomi email dengan 2 file yang di lampirkan.
cukup sekian

Best Regards,

Meliza
https://meliza766hi.wordpress.com

--0015175cfa3e7ac2f10481478be8
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

Salam,<br><br>Tes tes tes<br>tes anatomi email dengan 2 file yang di lampir=
kan.<br>cukup sekian<br><br><br><br>Best Regards,<br><br><br>Meliza<br><a r=
el=3D"nofollow" href=3D"https://meliza766hi.wordpress.com/" target=3D"_blank=
">https://meliza766hi.wordpress.com</a>

--0015175cfa3e7ac2f10481478be8--

Lampiran 1

--0015175cfa3e7ac2f80481478bea
Content-Type: application/pdf; name="handbook.pdf"
Content-Disposition: attachment; filename="handbook.pdf"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_g6j4oon40

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Lampiran 2

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Content-Disposition: attachment; filename="haloha.docx"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_g6j4oxm61

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Bila diperhatikan anatomi surel di atas, terdapat semacam jenis tag kalau di html. Di sini pemisah menggunakan string panjang , seperti contoh diawali dengan  –0015175cfa3e7ac2f10481478be8 , dan diakhiri dengan –0015175cfa3e7ac2f10481478be8–

Metode/ format yang digunakan untuk mengkode pesan pada lampiran adalah base 64. Metode ini hanya dapat menangani data sampai 7-bit, sehingga untuk meng-encode data, sekelompok data yang berisi tiga bytes akan diubah menjadi empat dengan 6-bit. Tiap 6-bit akan diganti dengan karakter  US-ASCII yang bersesuaian dengan alfabet 64.

Penggunaan algoritma encode base 64 pada metode ini menyebabkan pesan/lampiran tidak dapat dibaca tanpa di-decode terlebih dahulu, namun ukuran pesan akan lebih besar sampai sekitar 33 persen.

Cukup sekian,sampai jumpa di tugas berikutnya😉

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