可以通过邮件编码进行解决：
[table=95%][tr][td][font=FixedSys]9.2 Example with absolute URIs to an embedded GIF picture
From: [email]foo1@bar.net[/email]
To: [email]foo2@bar.net[/email]
Subject: A simple example
Mime-Version: 1.0
Content-Type: Multipart/related; boundary="boundary-example-1";
type=Text/HTML; start=foo3*[email]foo1@bar.net[/email]
--boundary-example-1
Content-Type: Text/HTML;charset=US-ASCII
Content-ID: <foo3*[email]foo1@bar.net[/email]>
... text of the HTML document, which might contain a hyperlink
to the other body part, for example through a statement such as:
<IMG SRC="http://www.ietf.cnri.reston.va.us/images/ietflogo.gif"
ALT="IETF logo">
--boundary-example-1
Content-Location:
[img]http://www.ietf.cnri.reston.va.us/images/ietflogo.gif[/img]
Content-Type: IMAGE/GIF
Content-Transfer-Encoding: BASE64
R0lGODlhGAGgAPEAAP/////ZRaCgoAAAACH+PUNvcHlyaWdodCAoQykgMTk5
NSBJRVRGLiBVbmF1dGhvcml6ZWQgZHVwbGljYXRpb24gcHJvaGliaXRlZC4A
etc...
--boundary-example-1--[/font][/td][/tr][/table]
[table=95%][tr][td][font=FixedSys]9.4 Example using CID URL and Content-ID header to an embedded GIF
picture
From: [email]foo1@bar.net[/email]
To: [email]foo2@bar.net[/email]
Subject: A simple example
Mime-Version: 1.0
Content-Type: Multipart/related; boundary="boundary-example-1";
type=Text/HTML
--boundary-example-1
Content-Type: Text/HTML; charset=US-ASCII
... text of the HTML document, which might contain a hyperlink
to the other body part, for example through a statement such as:
<IMG SRC="cid:foo4*[email]foo1@bar.net[/email]" ALT="IETF logo">
--boundary-example-1
Content-ID: <foo4*[email]foo1@bar.net[/email]>
Content-Type: IMAGE/GIF
Content-Transfer-Encoding: BASE64
R0lGODlhGAGgAPEAAP/////ZRaCgoAAAACH+PUNvcHlyaWdodCAoQykgMTk5
NSBJRVRGLiBVbmF1dGhvcml6ZWQgZHVwbGljYXRpb24gcHJvaGliaXRlZC4A
etc...
--boundary-example-1--
[/font][/td][/tr][/table]