Amazon Web Services
AWS hosts the single-owner application and encrypted storage in Frankfurt and supplies Cognito authentication, container storage, Secrets Manager, monitoring, DNS and infrastructure operations.
OpenAI
OpenAI processes the bounded context required for an owner-requested assistant run or signature-style generation. Mailroom sends Responses requests with store:false.
The owner's mailbox provider
Hostinger currently supplies the hosted beta's IMAP and SMTP mailbox. Mailroom reads and stages actions against that account; Hostinger remains the source of truth and delivery provider.