import { MailEventRepository } from './MailEventRepository';
interface PayloadEvent {
    id: string;
    timestamp: number;
    event: string;
    message: {
        headers: {
            'message-id': string;
        };
    };
    recipient: string;
}
interface Payload {
    signature: string;
    mail_events: PayloadEvent[];
}
interface Labs {
    isSet(key: string): boolean;
}
interface Config {
    get(key: string): any;
}
export declare class MailEventService {
    private mailEventRepository;
    private config;
    private labs;
    static readonly LABS_KEY = "mailEvents";
    static readonly CONFIG_KEY_PAYLOAD_SIGNING_KEY = "hostSettings:mailEventsPayloadSigningKey";
    constructor(mailEventRepository: MailEventRepository, config: Config, labs: Labs);
    processPayload(payload: Payload): Promise<void>;
    validatePayload(payload: Payload): void;
    private verifyPayload;
}
export {};