mail_to link character limit?

I am creating a mail_to link in my app which contains all the information the application needs to send. This can result in mail_to links that would be, on occasion, very, very long. When the message body is long it seems the mail_to link is concatenated at around 2083 characters.

Does anyone know of a way around this? Is there a limit on the link's character length because of an html limitation, or is it a ruby/rails limitation?

Thanks, Peter