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Who this is for: Brand users. Go to Settings → Email Settings.
Keystone sends email for draft order approvals, campaigns, notifications, and automated reports. Email settings control who messages appear to come from and which addresses must never be emailed.

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Senders

Go to Settings → Email Settings → Senders. Configure how outbound email appears to recipients: No DNS setup is required when using the Keystone platform domain (@mg.keystoneb2b.io).

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Custom sending domain (optional)

To send from your own domain (e.g. orders@mg.yourbrand.com):
  1. Go to Settings → Email Settings and scroll to Custom Sending Domain
  2. Enter a subdomain starting with mg. (e.g. mg.yourbrand.com) and click Add custom domain
  3. Add the DNS records shown in the table at your domain registrar (copy buttons are provided)
  4. Click Check verification — DNS can take up to 48 hours to propagate
  5. Once verified, set your sender prefix and click Save Configuration
  6. Send a test email to confirm delivery
You can Switch back to Keystone domain at any time to return to @mg.keystoneb2b.io without losing your custom domain in Mailgun.
Use a subdomain like mg.yourbrand.com, not your root domain. This is Mailgun best practice and keeps your main domain reputation separate.

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Test email

Enter a test address and click Send test email to verify your sender configuration before campaigns or notifications go live.

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Delivery stats

The senders page shows recent delivery statistics for your tenant when available.

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Do Not Email

Go to Settings → Email Settings → Do Not Email. Manage addresses that must not receive email from your brand:

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Adding suppressions

  • Search for a customer and add their buyer contact emails
  • Manually add any email address
  • Link-based unsubscribes from campaign emails appear automatically (read-only — buyers opted out via the email link)

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Removing suppressions

Manually added entries can be removed. Link-based campaign unsubscribes cannot be removed from this screen without the buyer’s consent.
Do not remove link-based unsubscribes and re-email those contacts without explicit permission. This may violate CAN-SPAM and similar regulations.