emailmail.app
Is there any way to embed an SVG in an email? If I try to attach it the same way I'd embed an image file, it comes out as an attachment, rather than a visible image.
For some content (e.g. charts, diagrams), .svg is much smaller than images, so it would be nice to send smaller emails by embedding .svg. Apparently mail.app can render them …
There are at least two apps which support something like this:
Note application with the ability to define actions for these notes based on the standard URL scheme. Sending mails to pre-defined addresses is easily possible
Quick starter for apps, using URLs as well. Using an URL with the mail recipient included will open Mail with an empty mail already addressed correctly.
You should be able to use the "Redirect" option, under the Message menu. Actually, if I'm reading your question right, you should be able to do this entirely through a rule, with no Applescript needed.
Building from "How to batch forward messages from Mail.app", if you make a rule that targets emails sent to mac@email.com, just say "Redirect Message" to "email@gmail.com".
Example: 
Make sense?
Best Answer
Never mind. Despite the fact that the compose window shows the .svg as an attachment, if you send the email to yourself, it renders properly when you receive it.