对Mail multipart/alternative vs multipart/mixed的回答建议附件应该是multipart/alternative
消息的对等体,例如:
- some/thing (disposition: attachment)
- some/thing (disposition: attachment)
- ...
我想发送电子邮件与html部分与一些内联图像和一个纯文本的替代方案。各个部分的首选MIME布局是什么?有几个选项出现在示例代码和其他问题中,但哪些在实践中效果最好?我的倾向是:
引用图像
这样,图像显然是为了呈现html部分。一个完整的例子是:
From: Rich Example <rich-example@example.org>
To: A Recipient <recipient@example.org>
Subject: An example of email with images and a plain alternative
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="outer-boundary"
This is a MIME-encoded message. If you are seeing this, your mail
reader is old.
--outer-boundary
Content-Type: text/plain; charset=us-ascii
This message might make you :) or it might make you :(
--outer-boundary
MIME-Version: 1.0
Content-Type: multipart/related;
type="text/html"; start="<body@here>"; boundary="inner-boundary"
--inner-boundary
Content-Type: text/html; charset=us-ascii
Content-Disposition: inline
Content-ID: <body@here>
<html>
<body>
This message might make you
<img src="cid:smile@here" alt="smile">
or it might make you
<img src="cid:frown@here" alt="frown">
</body>
</html>
--inner-boundary
Content-Type: image/gif
Content-Disposition: inline
Content-Transfer-Encoding: base64
Content-ID: <smile@here>
R0lGODlhEAAQAKEBAAAAAP//AP//AP//ACH5BAEKAAIALAAAAAAQABAAAAIzlA2px6IBw2
IpWglOvTahDgGdI0ZlGW5meKlci6JrasrqkypxJr8S0oNpgqkGLtcY6hoFADs=
--inner-boundary
Content-Type: image/gif
Content-Disposition: inline
Content-Transfer-Encoding: base64
Content-ID: <frown@here>
R0lGODlhEAAQAKEBAAAAAAD//wD//wD//yH5BAEKAAIALAAAAAAQABAAAAIzlA2px6IBw2
IpWglOvTahDgGdI0ZlGW5meKlci75drDzm5uLZyZ1I3Mv8ZB5Krtgg1RoFADs=
--inner-boundary--
--outer-boundary--
发布于 2013-12-31 11:57:57
你是正确的。内联图像应该存储在multipart/related
mime实体(RFC2387)中,并且可以使用multipart/alternative
(RFC2046)提供多种内容类型选项。
要添加附件,您可以将整个结构放入multipart/mixed
中,然后添加附件。
- some/thing (disposition: attachment)
- some/thing (disposition: attachment)
您也可以在文本/纯文本消息中使用内联图像,但不是所有的MUA都支持此功能。(使用none或disposition: inline)
下的文本)
我不知道一种干净的方法来将它与一个多部分/可选的HTML-email结合起来。
https://stackoverflow.com/questions/10631856
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