This package provides a command \makeenvelope which draws a layout to fold the first page of a letter into its own envelope, fulfilled with the recipient's and sender's address.

The package also provides an estimation of the total letter's mass to foresee the stamping rate, and can print a stamp provided as a picture on the envelope.

It can be useful when running out of envelopes, or to spare a little of paper (especially when letter is an odd number pages long). It can also help implementing a (somewhat "poor man's") automated batch letter generating system.

This package is provided under GNU General Public Licence v3 (https://www.gnu.org/licenses/gpl-3.0.en.html), or any later version.