It can be very frustrating when there's a misspelled email address stored in your list with previous recipients. You type in part of the intended recipient's address, and end up selecting the wrong one. Here's how to delete the address from the list:
Simply type in part of the address, and hover with your mouse cursor over the address. Then click on the x behind the address, to delete it from the list.
You should then delete your cookies. This will clear the autofill for your email addresses and allow you to continue sending out your transfers without the email correcting to the wrong address.