anti 94f82c9089 feat(smtp): fix DATA state machine; add SMTP_OPEN_RELAY mode ...

- Buffer DATA body until CRLF.CRLF terminator — fixes 502-on-every-body-line bug
- SMTP_OPEN_RELAY=1: AUTH accepted (235), RCPT TO accepted for any domain,
  full DATA pipeline with queued-as message ID
- Default (SMTP_OPEN_RELAY=0): credential harvester — AUTH rejected (535)
  but connection stays open, RCPT TO returns 554 relay denied
- SASL PLAIN and LOGIN multi-step AUTH both decoded and logged
- RSET clears all per-transaction state
- Add development/SMTP_RELAY.md, IMAP_BAIT.md, ICS_SCADA.md, BUG_FIXES.md
  (live-tested service realism plans)

2026-04-10 01:03:47 -04:00

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