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CHANGELOG/16 SEPTEMBER 2026

RFC 8058 One-Click Unsubscribe & Dedicated IP Management

Deliverability
Backend
Compliance
Feature

Implemented RFC 8058 one-click unsubscribe compliance, dedicated sending IP pools with automated mailbox warmup schedules, tabular contact history, and abuse monitoring.

DELIVERABILITY & COMPLIANCE

  • RFC 8058 one-click unsubscribe. Added standard List-Unsubscribe and List-Unsubscribe-Post headers with signed preference tokens.
  • Dedicated IP management & warmup. Added sending IP pool management with provider-specific daily warmup schedules (Google, Yahoo, Microsoft).
  • Over-quota bounce policy. Added mailbox_full suppression handling and KumoMTA bounce rewrite rules for full recipient inboxes.
  • Origin resolution & abuse alerts. Resolved sender origins in email logs and integrated automated Slack alerts for suspicious sending spikes.

CONTACTS & AUDIENCES

  • Tabular contact history. Overhauled contact view with grid layouts, activity filtering (sent, opened, clicked, bounced), and 3D status badges.
  • Asynchronous CSV contact export. Enabled large contact list CSV exports backed by S3 with 202 Accepted status responses.
  • Contact group detail views. Added dedicated group detail views with custom property management and navigation shortcuts.

SECURITY & CORE

  • Log sanitization. Enforced strict log filtering to ensure OTP codes and DKIM private keys are never written to disk or logs.
  • Configurable DNS resolvers. Allowed custom DNS resolver injection to eliminate timeout bottlenecks during high-throughput validation.
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