Sender Domains And Verification

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.