- server/mail.py: guard nc_mail_get_message against an empty OCS payload so
MailMessage(**{}) can't raise an uncaught ValidationError (returns a clean
'not found' instead).
- server/mail.py: cap inlined attachment content at MAX_ATTACHMENT_CONTENT_BYTES
(5 MiB), replacing oversized bodies with a sentinel so a large attachment
can't blow up the MCP response.
- client/mail.py: harden the OCS meta statuscode parse against a non-numeric
value (treat as success) instead of letting int() raise an uncaught
ValueError.
- scanner.py: log the newest-N cap hit once per (user, mailbox) at info level
(discoverable without flooding multi-tenant logs on every scan tick).
- tests: add incremental-sync scanner cases (new message queued, reappeared
message clears grace, deletion after grace expiry).
Deferred (tracked, card #376): include doc_type in the _potentially_deleted
grace-period key — a pre-existing cross-cutting collision the reviewer flagged
as a follow-up, not a blocker.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
