declare module Email {
  function send(options: {
    from?: string;
    to?: string | string[];
    cc?: string | string[];
    bcc?: string | string[];
    replyTo?: string | string[];
    subject?: string;
    text?: string;
    html?: string;
    headers?: Object;
    attachments?: Object[];
    mailComposer?: MailComposer;
  }): void;
}

interface MailComposerOptions {
  escapeSMTP: boolean;
  encoding: string;
  charset: string;
  keepBcc: boolean;
  forceEmbeddedImages: boolean;
}

declare var MailComposer: MailComposerStatic;
interface MailComposerStatic {
  new (options: MailComposerOptions): MailComposer;
}
interface MailComposer {
  addHeader(name: string, value: string): void;
  setMessageOption(from: string, to: string, body: string, html: string): void;
  streamMessage(): void;
  pipe(stream: any /** fs.WriteStream **/): void;
}