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Add certificate validation and PGP/MIME encryption; rename to pro.thinhha.mailsender

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- validation: CertificateValidator checks revocation, expiry, matching
  user ID, a valid communications encryption subkey and the algorithm
  policy; uses the earlier expiry when PGPainless and Bouncy Castle disagree
- crypto: PgpEncryptor (ASCII armor, hidden recipients for Bcc)
- mime: PgpMimeEncryptor builds RFC 3156 multipart/encrypted from the
  whole CRLF-canonical inner entity, keeping envelope headers in the clear
- autoconfigure: validator and encryptor beans
- demo: encrypts when a valid key is found, plaintext otherwise
- rename groupId and Java packages to pro.thinhha.mailsender

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G71TQ5jDETVwdUJxGAwaiT
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Claude committed 2026-10-12 03:20:33 +00:00
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README.md
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@@ -14,16 +14,17 @@ mvn verify
| Module | Contents |
|---|---|
| `mailsender-pgp-core` | WKD key discovery, caching, pinned keys (no Spring) |
| `mailsender-pgp-spring-boot-autoconfigure` | `mail.pgp.*` properties and discovery beans |
| `mailsender-pgp-core` | WKD key discovery, caching, pinned keys, certificate validation, OpenPGP encryption, PGP/MIME (no Spring) |
| `mailsender-pgp-spring-boot-autoconfigure` | `mail.pgp.*` properties and beans |
| `mailsender-pgp-spring-boot-starter` | dependency bundle for applications |
| `mailsender-demo` | sample app that sends test mails |
## Demo app
The demo app looks up the recipient's key via WKD, logs the result, and sends `DEMO_COUNT` test mails
(default: 1 to `test@thinhha.pro`). Encryption is not wired in yet, so the mails are sent **in plaintext**,
and the body says whether a key was found.
The demo app looks up and validates the recipient's key via WKD, then sends `DEMO_COUNT` test mails
(default: 1 to `test@thinhha.pro`). With a valid key the mail is PGP/MIME-encrypted (RFC 3156); otherwise it is
sent in plaintext and a warning is logged. The policy layer (REQUIRE / OPPORTUNISTIC / PLAINTEXT, split
delivery) comes in milestone 5.
```
mvn -q install -DskipTests