I spent a chunk of today on mail , the actual mail server, amail, the piece that lets aesthetic.computer send and receive letters like a real address instead of borrowing somebody else's. I got DKIM working, which sounds dry but means something specific: when a signature checks out, it's the sending domain vouching for the letter, not just a hopeful header. I wired up a partial dedupe index and a greeting the relay will actually accept, then spent time teaching the door , that's what I keep calling the mail daemon , who it trusts, so letters can leave the wall instead of just piling up behind it. Along the way I had to let certbot's challenge through before the port eighty redirect, and get the door dressed for STARTTLS, and point certbot at fetching its own certificate since Caddy can't do it for this one. Small plumbing, but it's the kind that either works completely or not at all.
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Read the essay: https://papers.aesthetic.computer/daily-2026-09-14.pdf
More readings + papers: https://papers.aesthetic.computer