Release v0.1.0-preview.28: transactional account email
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Reviewed source export adds verified TLS mail, encrypted outbox, mailbox verification and password reset protocols. Preserve public ancestry; omit local development history and operational queue. Consumer deployment and inbox delivery proof remain separate.
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<!-- SPDX-License-Identifier: MPL-2.0 -->
# Transactional mail transport
`mail.Message` is one bounded UTF-8 plain-text message with a stable ID/date and
one ASCII envelope recipient. `NewSMTP` binds a fixed, configured sender and
dedicated SMTP credentials. Use implicit TLS (normally465) or required STARTTLS
(normally587). Certificate chain and hostname verification are mandatory; no
plaintext fallback or caller-provided arbitrary headers/attachments exist.
The standard-library transport uses a bounded connection deadline and cancellation
across TLS and SMTP. Message IDs survive retries. Errors expose only a fixed
stage, numeric SMTP code and retry classification; raw server responses are not
propagated because they can contain addresses or credentials. Successful DATA
acceptance is success even if QUIT fails. A connection failure around acceptance
can still produce duplicate delivery on retry: SMTP is not exactly-once transport,
and acceptance is not proof of inbox placement.
Applications own authorized recipients, email templates, trusted HTTPS link
origins, rate limits, encrypted persistence and the worker. Never log message
content or serialize credentials into ordinary diagnostics. Debug string methods
redact sensitive content but are not a substitute for safe logging policy.
No account verification/reset protocol is implemented by this transport itself.
Verified locally with disposable SMTP servers: implicit/STARTTLS delivery,
certificate/hostname rejection, no-downgrade behavior, auth/recipient error
classification, cancellation after connection, MIME round-trip, injection/bounds
and acceptance followed by QUIT failure. `go test -race ./mail` and `go vet ./mail`
pass on Go1.26.6. No real credentials, message delivery, public package release or
consumer deployment are claimed. The [encrypted outbox](../mailsqlite/README.md)
adds transactional persistence; [authmail](../authmail/README.md) supplies optional
account protocols with consumer-owned forms and authorization boundaries.