export declare type Encoding = 'UTF-8' | 'Windows-1252';
interface EmailTemplate<T> {
    from: T;
    html: T;
    subject: T;
    text: T;
    to: T;
}
export interface Payload extends EmailTemplate<string> {
    attachments: number;
    charsets: EmailTemplate<Encoding>;
    dkim: {
        [key: string]: string;
    };
    email?: string;
    envelope: Envelope;
    files?: {
        [key: string]: string;
    };
    headers?: string;
    sender_ip: string;
    SPF: string;
}
export interface Envelope {
    from: string;
    to: string[];
}
export {};