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Email APISend with one JSON request.SMTP RelayPort 587 · STARTTLS.

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Delivery LogsSearch delivery statuses.Suppression ListsAutomatic suppression of bounces and complaints.

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SRS Postline

Blog

Product updates, release notes and engineering notes from the Postline team.

EngineeringNovember 5, 2026

Webhooks: events, signatures and retries

Which events Postline sends, how to verify every request and what happens when your endpoint is down.

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  • Release notesJuly 24, 2026

    Passwordless dashboard access

    Opened dashboard login via email one-time codes.

    Read article →
  • Release notesJuly 23, 2026

    Public-readiness hardening

    Replaced demonstration KPIs with labelled safety controls.

    Read article →

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Transactional email for modern products — API, SMTP, and full delivery visibility.

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