The Response Promotion Redemption plugin allows you to create partner promotions with list of your promotion codes and your partners.
response-promotion-redeemerfolder to the
[promo-form] attr 1 = start_message="This is the message to be used in the beginig of your email" attr 2 = end_message="This is the message to be used in the end of your email and confirmation display message on the front end to users"
adding "" in either attribute will create a paragraph break in you plaintext email
" in either attribute will create a line break in you plaintext email