I can only think of two suggestions, of a sort. One requires you to be on the same network as a computer, and installs some software. The other requires Evernote. Neither actually sends and attachment.
For the first, you need a computer with DropBox installed, and either FingerPrint or Printopia to enable AirPrinting. Both of these apps will allow you to print your email as a PDF directly to the DropBox folder on the computer. Once it is there you can use the DropBox create/copy share links for the PDF's of the email and paste them into your new email.
Second. Evernote comes with an email address. You forward your emails to Evernote using this. Once there you place them in a Notebook together, then use Evernote's share feature to share that notebook. This generates an email with a link for the people you shared it with, and your recipient will need a web browser to view the notes, at least the first time. If they also have an Evernote account they can add the notebook (view only for a free account) to their own account.
Extra features available if you go with a paid Premium account.
There is probably a better way, but that's all I can think of with the apps I have on hand.