Connect email (Resend)

Email delivery uses your own Resend account — Hollow Sentinel does not send mail on Arcanum's domain. Starter and above support daily briefing email and critical insight alerts when you save a verified API key, from address, and alert recipients in Settings.

Setup

1. Create a Resend account and verify your sending domain.
2. Create an API key with send access.
3. Open Hollow Sentinel → Settings → Email alerts (Resend).
4. Paste the API key, enter a verified from address, and add one or more alert recipients.
5. Click Save email alerts, then Send test email to confirm delivery.

What Sentinel sends

• Daily briefing digest when briefing channel is Email (default on Starter)
• Critical insight alerts — at most one email per insight type per day
• Command center briefings still appear in the app when email is not configured

Connect Slack (Growth+ briefing channel)

Troubleshooting email delivery