Do we need more stamps when the attachments are larger? And/or is it more about the distance (hops) of travel?

The stamps on a received mail should get semi-transparant post marks for each hop from the respective server. Could be generated from the mail header info.

Can't wait for bouncing mails because there weren't enough stamps on it :D

But serious question: where would I "inject" my stamp generation on the mail process? Would need to be a client plugin or something like that, I guess?

@bleeptrack this is quite a wholesome idea! some ways to prototype this could be a custom email web client that renders the mails in this way, or a daemon that fetches and forwards your mails to another of your addresses, with stamps attached