export interface EmailAdapter {
    /**
     * This method is called to validate the configuration of the adapter
     * and should throw a clear user-readable error if the configuration is invalid.
     */
    validate(): Promise<void>;
    /**
     * This method should send an email using the adapter
     * @param from - The sender's email address
     * @param to - The recipient's email address
     * @param text - The plain text version of the email
     * @param html - The optional HTML version of the email
     * @param subject - The subject of the email
     */
    sendEmail(from: string, to: string, text: string, html: string | undefined, subject: string): Promise<{
        error?: string;
        ok?: boolean;
    }>;
}
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