Short answer: for a beginner SaaS sending marketplace order notifications, an API-first email provider is viable when it offers domain verification, suppression controls, and queryable delivery events; choose an established alternative such as SendGrid, Resend, or Postmark instead when SMTP relay...
Source: [Dev.to](https://dev.to/sullivanreed1247/email-deliverability-provider-comparison-api-domain-verification-without-smtp-relay-1ncl)