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Reject only when |now - timestamp| exceeds the tolerance, so small clock skew between Lettermint and the receiver no longer fails every webhook.
src/main/java/co/lettermint/types is generated by the SDK generator (emit java, profile next, spec 80d8ab2a2d). ./gradlew generateTypes regenerates it with LETTERMINT_SDK_GENERATOR or ../sdk-generator; checkGeneratedTypes, part of check, verifies it or, without the generator, its headers. The build compiles with --release 17 on Gradle 9.6.1, and the version comes from -PreleaseVersion instead of a 2.0.0 placeholder.
… tokens One thread-safe client replaces Lettermint.email(), Lettermint.api(), ApiClient and LettermintClient: Lettermint.builder().sendingToken(...) .teamToken(...).build(), or Lettermint.of(token) with prefix detection. emails() uses the sending token, every other part the team token, and ping, messages.reschedule and messages.cancel accept either. A missing token is a LettermintConfigException that names the option. Sending holds no state: emails().send(EmailMessage, SendOptions), sendBatch and an immutable compose() builder whose setters return new builders. The Idempotency-Key is a per-call option. Tags are validated before any request. The transport uses java.net.http with redirects never followed (a 3xx is a RedirectException), no retries, a timeout that covers the whole request, cancellation by thread interrupt, typed exceptions for every outcome and no tokens in toString or exception messages. OkHttp is removed. Lists return CursorPage<T> and iterate() follows next_cursor. Webhook verification requires X-Lettermint-Signature and X-Lettermint-Delivery, accepts any matching v1, rejects a negative tolerance and reports a WebhookVerificationException.Reason. BREAKING CHANGE: every 2.x entry point, model and exception is replaced; Java 17 or later is required. See UPGRADE.md.
The release workflow passes -PreleaseVersion instead of editing build.gradle and the removed pom.xml, and checks the jar manifest and BuildInfo before publishing. CI runs ./gradlew build, which includes javadoc and the generated-header check.
UPGRADE.md has before/after examples for every changed call, the full type rename table, the removed classes and types, and a ready-to-copy instruction for upgrading with a coding agent.
The spec at lettermint/lettermint@0b4ecbdd23 (main, the #2582 merge) is identical to the previous pin; only the generated file headers change.
Bjornftw
approved these changes
Oct 4, 2026
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Summary
A new major version, following the Lettermint SDK design agreed for all languages. The reference is the Node.js SDK 3.0 (lettermint/lettermint-node#36). Sending holds no state on the client, types are generated from the published API spec, and every SDK passes the same conformance suite.
What changes
sendingTokenand/orteamToken. A single token string is detected by prefix:lm_team_is a team token,lm_plus letters and digits is a sending token, and anything else is a config error. Each part uses its own token and never falls back to the other.emails.send(message, options),emails.sendBatch(…)and an immutable per-messagecompose()builder. The idempotency key is a per-call option. Attachments are objects.0b4ecbdd23) using its names. Enums are open, so new API values never break decoding.verify(rawBody, headers)requires bothX-Lettermint-SignatureandX-Lettermint-Delivery, accepts any matchingv1, uses a ±300 s tolerance, and keys the HMAC on the secret as-is. Reason codes are the same in every SDK.Specific to this SDK
java.net.http, which actually aborts on timeout. CI tests 17, 21 and 25.Lettermint.builder()orLettermint.of(token).compose()returns an immutable builder.-PreleaseVersionfrom the tag and refuses SNAPSHOT versions. The brokenpom.xmlis removed.Verification
--strict. 2.7.0 fails 9, including the token following a redirect to another host.Release
Publish a GitHub release
v3.0.0. It publishes to Maven Central.Docs for all SDK majors: lettermint/lettermint#2594 (stacked on lettermint/lettermint#2590). Merge it after the releases.
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