You voluntarily send swaps to members who have not received their swap from their assigned swap partner in an event.
A resend request will first be sent to the original swap partner if a swap is marked as lost. If the person declines the swap, a resend request will be made to the event creator. If the creator also declines it or if the creator has indicated not to be an Angel for the event, we will look for other Angels.
If you get a request to Angel, you still have the option to decline the swap. So you're totally in control, and you can cancel at any time.
I want to be a Snail Mail Friends Angel:
Log in to your Snail Mail Friends account
Go to Account > My Profile
Navigate to Edit Basic Information
Enable the option I will Angel lost swaps
Click on the Save Changes