We regularly receive emails from 2 different senders. The emails are fine if they are sent directly to us. If blind copied, the emails are garbled and the message is buried in a mess of typing characters.
What is your email program? I suspect that when copying the content the formatting isnt being stripped of. You may either grab the emails in text-only OR copy the email first into a Notepad file which will strip that mess of characters.
Are the senders using encryption?