HTML电子邮件正文是否可以引用作为附件发送的文件（在同一电子邮件中）？
问题描述：
HTML电子邮件可以使用图片附件作为标记的来源吗？
Can an HTML email use an image attachment as the source for tag?
假设我正在发送一封电子邮件，其中包含每个电子邮件的特定图片 - 它们作为电子邮件的附件发送 - 电子邮件中的HTML正文可以使用图片？我的猜测是否，但是有没有任何 hacks 或解决方法，这将使其工作？
Let's say I am sending an email with per-email specific images - and they are sent as an attachment to the email - can the HTML body within the email use the those images? My guess would be no, but are there any hacks or workarounds that would make it work?
答
不需要黑客。使用 cid： URI计划
No hacks needed. Use the cid: URI scheme
--boundary-example 1
Content-Type: Text/HTML; charset=US-ASCII
to the other body part, for example through a statement such as:
<IMG SRC="cid:foo4*foo1@bar.net" ALT="IETF logo">
--boundary-example-1
Content-ID: <foo4*foo1@bar.net>
Content-Type: IMAGE/GIF
Content-Transfer-Encoding: BASE64
R0lGODlhGAGgAPEAAP/////ZRaCgoAAAACH+PUNvcHlyaWdodCAoQykgMTk5
NSBJRVRGLiBVbmF1dGhvcml6ZWQgZHVwbGljYXRpb24gcHJvaGliaXRlZC4A
etc...
--boundary-example-1--