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Mangrove tells you about deploys in three places.

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Email

Set two variables, and Mangrove emails you when a deployment deploys successfully:
Emails go through Resend. They’re sent from Mangrove <onboarding@resend.dev>, which needs no domain setup. Set MANGROVE_RESEND_FROM to use your own verified sender. You also get an email when a deployment becomes publicly reachable for the first time. There’s one recipient per install, and only successful deploys are emailed. A failed deploy shows in the dashboard and, for GitHub deploys, as a failed commit status. Every email attempt, sent or failed, is listed under Admin → Notifications.

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GitHub commit statuses

For deploys triggered by a push or a PR, Mangrove posts a status to the commit: pending while it builds, then success or failure. It shows up on the commit and the pull request like a CI check.

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Pull request comments

With PR previews on, each PR gets one bot comment that’s edited as the preview builds, showing “building”, then the preview’s address or the error.

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Milestones

The dashboard shows a one-time message for your first successful deploy and your first rollback in each browser. That’s all; there’s no notification feed.