New

• deliverability: block sends to spamtrap and typo-domain recipients #510
• deliverability: auto-suppress stale recipients after 90 days of inactivity #509
• deliverability: per-recipient engagement tracking #508
• bounces: suppress addresses after 5 cumulative soft bounces
• delivery: parse Retry-After hints from SMTP 4xx responses
• reporting: add TLS-RPT report receiver (RFC 8460)
• dkim: add ED25519 key generation and signing support
• inbound: add SPF verification for incoming email

Fixed

• delivery: increase retry window from 3min to 42h
• dkim: add missing AUID to ED25519 signer for consistency with RSA
• api: bound scam classifier accept latency #507