Email attachments have been limited to files forever, but now Google is rolling out a feature in Gmail that lets you attach money. Using Google Wallet, a new button ($) in the Gmail compose window will allow you to easily send money as a gift or repayment. On the back end its the same as the money exchange system offered within Google Wallet, which means it’s free if transfered from a bank account. The sender will have to pay a 2.9% fee per transaction (minimum $0.30) if using a credit or debit card. Money can be sent to people who don’t have a Gmail or Wallet account, though the recipient will need to sign up for Wallet to accept money. Once someone receives money, they can deposit it to a bank account or use it anywhere Wallet is accepted. While Google has offered money transfers for some time, the update gives the feature prime real estate in Gmail — making it likely that it’ll grab some business from competitors like PayPal.