Delivery Modes
- Hosted Mailbase plans use Mailbase-managed sending after sender-domain verification.
- The BYO useSend plan connects a user-managed useSend instance, API URL, API key, default sender, and webhook secret.
- A workspace slug address can help onboarding, but production campaigns should use a verified sender domain.
Verify A Domain
- Add and verify the domain in the active useSend provider first.
- Publish the provider's SPF, DKIM, and DMARC DNS records at your DNS host.
- Open Settings, then Sender emails, and refresh domain health.
- Add a sender address using any local part on a connected verified domain.
Workspace Safety
Mailbase lists only provider domains already connected to sender emails in the current workspace. When adding a sender, the selected provider domain must match the email domain and must belong to the workspace.
If the workspace cannot be resolved, Mailbase fails instead of guessing a workspace or falling back to a first database row.
Domain Health
- Settings shows provider verification state and DNS record details when useSend returns them.
- Cached sender status keeps the UI useful if the provider is temporarily unavailable.
- Delivery analytics also surface provider health rates, bounce clusters, and complaint clusters for follow-up.