export declare const getEmailDomain: (email: string) => string;
/**
 * Whether a domain is a public/consumer email provider that no single
 * organization can own. Normalizes case before checking.
 */
export declare const isPublicEmailProviderDomain: (domain: string) => boolean;
export declare const isValidEmailDomain: (value: string) => RegExpMatchArray | null;
export declare const validateOrganizationEmailDomains: (domains: string[]) => string | undefined;
export declare const isValidEmailAddress: (email: string) => boolean;
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