Broadcasts
One message sent to many Slack channels at once, with per-channel delivery tracking.
A broadcast is one message sent to many Slack channels at once, with per-channel delivery tracking. Compose it once, and a single send posts it to every channel in its targeted audiences.
Blocks
A broadcast is composed of blocks — headings, paragraphs, lists, dividers, and other Slack Block Kit elements. Each block can carry its own targeting, so a single draft can show a different subset of blocks to different audiences while still sending as one broadcast.
Lifecycle
A broadcast starts as a draft. From there it moves to scheduled — armed
to send at a future time — or straight to sending. Sending resolves to a
terminal state: sent if every targeted channel delivered, partial if
some channels delivered and others didn't, or failed if none did. A
broadcast with no deliverable channels finalizes as empty rather than
sent.
A draft, scheduled, or sending broadcast can be canceled, which
finalizes it as canceled; a terminal broadcast can't be canceled. A
scheduled broadcast is also auto-held as paused if the Slack connection
drops.
Results
Once a broadcast has sent, its report view shows per-channel delivery status alongside the replies and reactions it collected in Slack. The same send-fidelity render that produced the preview is what posted, so the report reflects exactly what audiences saw.