1 it uses the html email to send into site mail so looks bit stupid 
to have the 
thanks
sitename

in mailbox 

2  it makes separate mails for every poke filling mailboxes up everywhere
if a user send a poke back it should continue the original users poke like as it been replied to 

maybe just make it send mail to the user and not into mail box and make a page for the poke like gifts page where users can reply the poke 

have add  images for pokes would be super cool