We should stick stamps on emails just because it's cute.
@mntmn @bleeptrack sadly you probably cannot build a plugin for a receiving mail server because it would break DKIM signatures. The outgoing server however could add stamps and the mail client then has to render the postmark depending on the mail header. But that would be complicated because it touches so many software projects. I think a client only solution would be the easiest (or you do the spam processing and afterwards deliberately remove the DKIM signature on the receiving server)
Now i want this 🙂 it’s such a neat idea to bring back some of the “old days”. I remember decorating the envelopes was a thing too that’s completely gone with electronic equivalents too.