이미지는 다음과 같은 첨부 파일로 메시지에 포함되어야합니다.
Content-Type: image/png; name="sig.png"
Content-Disposition: inline; filename="sig.png"
Content-Transfer-Encoding: base64
Content-ID: <0123456789>
Content-Location: sig.png
base64 data
그리고 HTML 부분은 다음과 같은 이미지를 참조합니다.
<img src="cid:0123456789">
일부 클라이언트에서는 src = "sig.png"도 작동합니다.
기본적으로 이미지 첨부 파일이 관련 부분에있는 multipart / mixed, multipart / alternative, multipart / related 메시지가 있습니다.
원격이 아니므로 클라이언트도이 이미지를 차단해서는 안됩니다.
또는, 여기에 mbox 파일로 multipart / alternative, multipart / 관련 예제가 있습니다.
From
From: from@example.com
To: to@example.com
Subject: HTML Messages with Embedded Pic in Signature
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="alternative_boundary"
This is a message with multiple parts in MIME format.
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 8bit
test
[Picture of a Christmas Tree]
Content-Type: multipart/related; boundary="related_boundary"
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: 8bit
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<p>test</p>
<p class="sig">
</body>
</html>
Content-Type: image/png; name="sig.png"
Content-Disposition: inline; filename="sig.png"
Content-Location: sig.png
Content-ID: <0123456789>
Content-Transfer-Encoding: base64
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cHkgSG9saWRheXMgUGFnZQA7
Sylpheed 또는 Thunderbird (가져 오기 / 내보내기 도구 확장 포함) 또는 Opera의 내장 메일 클라이언트로 가져올 수 있습니다. 그런 다음 예를 들어 Opera에서 "일반 텍스트 선호"를 전환하여 HTML과 텍스트 버전의 차이를 확인할 수 있습니다. 어쨌든 HTML 버전이 sig에 포함 된 그림을 사용하는 것을 볼 수 있습니다.