jcoffey-dev is traveling from Thursday 1 October through Sunday 4 October. Issues and pull requests are welcome, and will get an answer after that. Thanks for your patience.
Phase 2g of the DLP and mail flow rules spec: transport rules now act,
on outgoing and incoming mail.
- features/mailflow/rewrite.rs: add or remove a header, prefix or set the
subject (an RFC 2047 word when not ASCII), add a disclaimer. A
disclaimer edits the message's main text and HTML bodies only, each
decoded, changed and written back as UTF-8 quoted-printable with its
other headers kept, top or bottom (after <body> or before </body> in
HTML); attachments and attached messages are left alone, and a
disclaimer already present isn't added again.
- smtp/inbound/mailflow.rs: the check runs for incoming mail too
(transport rules only; DLP stays outgoing). After DLP passes, each
matched transport rule's actions run in order: message edits,
add-recipient and redirect (envelope changes DATA applies), route (a
per-message queue ahead of the queue strategy), refuse (550 5.7.1
with the rule's text). The override tag is stripped with the same
subject writer, so a non-ASCII subject stays valid.
- Audit: refusals and changes to where mail goes are recorded (sender,
or system:mail-flow for incoming mail); wording and header changes
aren't, or a banner rule would record every message (spec §2.7).
Tests: rewrite unit tests (headers, encoded subjects, disclaimers on a
single part and on multipart/alternative with an attachment, once
only); mail_rules_tests gains the actions end to end: disclaimer,
header and subject prefix on a delivered message, a redirect, a
refusal, a banner on incoming LMTP mail that outgoing rules leave
alone, and which of those are audited.
jcoffey-dev