Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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I am able to send the email successfully from the machine using any command line utility (like sendemail). Machine is running Ubuntu 24 aarch64.

It’s pretty hard to determine what’s wrong.  Do you have more logs to share or maybe your redacted courier configuration.  