ACM > Structures > EmailValidationChallenge EmailValidationChallenge¶ Structure Class¶ EmailValidationChallenge dataclass ¶ Bases: _SerdeShape Contains the email addresses used for email-based domain validation. Attributes¶ validation_domain class-attribute instance-attribute ¶ validation_domain: str | None = ... The domain name that ACM uses to send validation emails. validation_emails class-attribute instance-attribute ¶ validation_emails: list[str] | None = ... A list of email addresses that ACM uses to send domain validation emails.