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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Does Kratos show error message for email sending? The fail log not appears when I set invalid smtp address and verify the account.
```api-kratos-1          | time=2023-01-11T16:06:28Z level=debug msg=Preparing verification code. address=test@test.com audience=application service_name=Ory Kratos service_version= via=email
api-kratos-1          | time=2023-01-11T16:06:29Z level=info msg=Sending out verification email with verification code. audience=audit email_address=test@test.com identity_id=adab1b6e-5639-4f8d-9f06-2fdb5ec21ec9 service_name=Ory Kratos service_version= verification_code_id=cd20f5c9-52ea-4a68-bade-2ef2da2342b2 verification_link_token=065018 via=email```

It should show it. How are you running the Kratos process? Are you aware that you either need to run it with the parameter `--watch-courier` or run the courier as a standalone process?