Knowledge Base Set up sending Add and confirm a sender

Add and confirm a sender

A sender is a From identity you send with: a from-address, a display name, an optional reply-to, the email types it’s used for, and a tracking domain. Before a sender can send, RadarSend confirms it actually works by sending a real test email through your provider.

Before you begin#

Add a sender#

Go to Settings → Sending → Senders and click + Add sender. The wizard has three steps.

Step 1 — From address#

On Who’s it from?, type the address you’ll send from (e.g. newsletter@yourdomain.com) in the Sending address field, then click Continue. It should be on a domain you’ve authenticated with your provider.

Step 2 — Details#

On How should it appear?, set:

  • Display name — the from-name recipients see (e.g. Acme Newsletter).
  • Reply-to — optional, where replies go.
  • Use this sender for these email types — tick at least one type this sender handles.

Click Continue. (No email types yet? Use the Set up email types → link first.)

Step 3 — Tracking & confirm#

On Tracking & confirm:

  1. Pick a Tracking domain (or Set up a new tracking domain inline).
  2. If you have more than one sending service, choose one under Sending service.
  3. Enter a recipient under Send a confirmation test to and click Send test. RadarSend sends one real email through your provider — if it’s accepted, this address can deliver.
  4. When the test is accepted, click Save sender.

If the test is rejected because the domain isn’t authenticated, RadarSend shows Authenticate {domain} (DKIM/SPF) for supported providers (Amazon SES, SendGrid, Mailgun, Resend, Mailjet) with the DNS records to add. See Authenticate your sending domain.

Save without confirming

You can , but the sender can’t actually send until at least one of its sending services is confirmed.

Sending services (lanes) and confirmation#

A sender can send through more than one sending service. Each sender × sending service pairing is confirmed independently with its own test send — RadarSend marks it verified only when a real test actually succeeds, so a sender can never send through an unproven service.

Manage these in the sender’s editor under Sending services:

  • Each service shows Verified or Needs confirmation.
  • Confirm runs a test send and, on success, marks the service verified.
  • Make default sets the verified service a broadcast uses by default.
  • + Add a sending service… adds another service for this sender (it starts unverified).

If you change the sender’s from-address, its services are reset to unverified — the earlier tests only proved the old address.

Common issues#

  • Sender saved but can’t send. It has no confirmed sending service. Open the sender and Confirm a service with a test send.
  • Test send rejected. The from-address isn’t authenticated at your provider — authenticate the domain (see above), then retry.
  • No tracking domain to pick. Set up a tracking domain first.
  • Can’t finish Step 2. You must select at least one email type; define one if none exist.

Good to know#

  • The from-address’s domain should match a domain you authenticated at your provider (SPF/DKIM), or the confirmation test will fail.
  • Adding a sender is also what makes its domain appear under Settings → Sending → Sending domains for warming and DMARC.