Spot the difference: Heleen's Halloween mail edition

Sent:

Received:

How many differences can you spot? How many of them seem necessary to you for correct delivery of this envelope?

Spot the difference... with Mail Art Martha

Martha epublishes her incoming mail and labels the sender.

Every now and again she writes something that amuses me.

Sent in an envelope made from a poster sent to me by Erni.

Spot the difference... with Jean