SendGrid - Nitrosend

Use your SendGrid account as the sending provider for Nitrosend campaigns, flows, and transactional email. See Email providers for how BYO sending works, plan requirements, and status semantics.

What you need

A SendGrid API key. Use a Full Access key, or a restricted key with Mail Send, Sender Authentication, and Inbound Parse permissions — Nitrosend uses SendGrid's domain authentication and Inbound Parse APIs when you add a sending domain.

Info

A Mail Send-only key passes the connection test (Nitrosend validates keys against SendGrid's scopes endpoint), but it cannot complete sending-domain setup.

Connect from the dashboard

Go to Integrations in Nitrosend.
Choose SendGrid.
Paste your API key and save. Nitrosend tests the connection as part of saving a new integration.

Connect via MCP

{
  "operation": "configure",
  "provider": "sendgrid",
  "api_key": "<SENDGRID_API_KEY>"
}

Warning

The MCP call stores the key without testing it. {"operation": "status"} reports stored configuration only — to actually test the credentials, run Test connection from the SendGrid integration page in the dashboard, or call POST /v1/my/integrations/{id}/test via the REST API.

Making it the active provider

If this is your first BYO provider, it becomes the brand's active email provider automatically. If you already had another provider connected, open the integration's page and choose Set as primary to switch sending to it.

Sending domains

After connecting, add your sending domain from Domains (or nitro_manage_domains). The DNS records returned come from SendGrid's domain authentication.

Troubleshooting

"SendGrid API key is invalid" — the key was rejected by SendGrid. Generate a new key from Settings → API Keys in SendGrid.
Domain setup fails after connecting — your key is missing the Sender Authentication or Inbound Parse permission. Use a Full Access key or add those scopes.
Rotated your key? Re-entering credentials resets this integration's verified domains to pending — re-verify them from Domains.