Simple Host sends email through Resend: sign-in codes, sign-in alerts,
email-change confirmations and undo links, domain and idle-cleanup warnings, new-Submissions
digests, and the account-deleted confirmation. Without
RESEND_API_KEY, nothing is sent and email-code sign-in is off (Google sign-in and the admin
key still work).
MAIL_FROM must be on a domain you have verified with Resend.
| Setting | Default | Allowed | What it does |
|---|---|---|---|
IDLE_REPLY_TO |
support@simple-host.app |
email address | Reply-To address of the idle-cleanup emails. |
RESEND_API_KEY |
none | secret | A Resend API key for sending email (sign-in codes, alerts). Without it, email sign-in is off. Security-sensitive. |
MAIL_FROM |
Simple Host <noreply@simple-host.app> |
text | The sender of every email, on a domain verified with Resend. |
Recipes
Email sign-in on a small box. Verify your domain with Resend, then:
RESEND_API_KEY=re_...
MAIL_FROM=Simple Host <noreply@example.com>