MailSchema

MailSchema is a web app + API that validates outbound email payloads and templates against a strict schema before you send. Teams define “contracts” for each email type (required fields, allowed variables, localization rules, attachment limits, header policies), then MailSchema blocks or flags sends that would render broken, violate internal rules, or cause downstream support tickets. It plugs into existing providers (SES, SendGrid, Mailgun, Postmark) via lightweight SDKs and can run in “monitor” mode first, then “enforce” mode once confidence is high. It also snapshots template versions so engineering and marketing stop accidentally drifting. This is not glamorous, but it’s the kind of boring reliability tooling that reduces incidents and makes compliance reviews easier. Expect slower sales cycles (B2B), but strong retention once embedded in CI/CD and send pipelines.