Set up Snailmail #
Go to
and activate the feature.If you would like this option to be a default feature, enable Send by Post under Default Sending Options.

Send your invoices by post #
Open your Invoice, click on the Send & Print button and select Send by Post.
Pricing #
Snailmail is an In-App Purchase (IAP) service which requires prepaid stamps (=credits) to work. Sending one document consumes one stamp.
To buy stamps, go to
and click on Buy credits, or go to and click on View my Services.