type ProxyOverrides = Partial<{
    host: string;
    port: number;
    maxBodyBytes: number;
    smtpHost: string;
    smtpPort: number;
    smtpUsername: string;
    smtpPassword: string;
    smtpSecure: boolean | string;
    requireSigning: boolean;
    keyId: string;
    secret: string;
    signingWindowMs: number;
}>;
export declare const SmtpProxyServer: Readonly<{
    start(overrides?: ProxyOverrides): Promise<void>;
}>;
export default SmtpProxyServer;
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