Should I send contracts through e-mail?
It is acceptable to send contracts through e-mail, and indeed often a sender will send the contract and require a receipt, meaning “this is a legal document I'm sending to you, signed, print out from an email, sign and send back”, as they want to know that it got to the receiver. E-mail doesn't usually fail, but with something as important as a contract someone will use “receipt required” in a business e-mail to make sure that the person got it. Thus when sending a contract through business e-mail, the sender will have to check the box “receipt”, making sure they did get the email and the contract.