I have a page upon which a user can choose up to many different paragraphs. When the link is clicked (or button), an email will open up and put all those paragraphs into th
Does the e-mail content need to be in the e-mail? Could you store the large content somewhere centrally (file-share/FTP site) then just send a link to the content?
This makes the recipient have an extra step, but you have a consistent e-mail size, so won't run into reliability problems due to unexpectedly large or excessive content.