diff --git a/smtp/message.ts b/smtp/message.ts
index a8b2a9d..98b7850 100644
--- a/smtp/message.ts
+++ b/smtp/message.ts
@@ -2,7 +2,6 @@ import fs from 'fs';
 import { hostname } from 'os';
 import { Stream } from 'stream';
 import type { Duplex } from 'stream'; // eslint-disable-line no-unused-vars
-import type { Indexed } from '@ledge/types'; // eslint-disable-line no-unused-vars
 import addressparser from 'addressparser';
 import { mimeWordEncode } from 'emailjs-mime-codec';
 
@@ -25,13 +24,15 @@ export const MIME64CHUNK = (MIMECHUNK * 6) as 456;
  */
 export const BUFFERSIZE = (MIMECHUNK * 24 * 7) as 12768;
 
-export interface MessageAttachmentHeaders extends Indexed {
+export interface MessageAttachmentHeaders {
+	[index: string]: any;
 	'content-type'?: string;
 	'content-transfer-encoding'?: string;
 	'content-disposition'?: string;
 }
 
-export interface AlternateMessageAttachment extends Indexed {
+export interface AlternateMessageAttachment {
+	[index: string]: any;
 	headers?: MessageAttachmentHeaders;
 	inline: boolean;
 	alternative?: MessageAttachment | boolean;
@@ -49,7 +50,8 @@ export interface MessageAttachment extends AlternateMessageAttachment {
 	stream: Duplex;
 }
 
-export interface MessageHeaders extends Indexed {
+export interface MessageHeaders {
+	[index: string]: any;
 	'content-type': string;
 	'message-id': string;
 	date: string;
diff --git a/smtp/smtp.ts b/smtp/smtp.ts
index 21e17c7..6952662 100644
--- a/smtp/smtp.ts
+++ b/smtp/smtp.ts
@@ -3,7 +3,6 @@ import { createHmac } from 'crypto';
 import { hostname } from 'os';
 import { connect, createSecureContext, TLSSocket } from 'tls';
 import { EventEmitter } from 'events';
-import type { Indexed } from '@ledge/types'; // eslint-disable-line no-unused-vars
 
 import { SMTPResponse } from './response';
 import { makeSMTPError, SMTPErrorStates } from './error';
@@ -108,7 +107,7 @@ export class SMTPConnection extends EventEmitter {
 	protected loggedin = false;
 
 	protected sock: Socket | TLSSocket | null = null;
-	protected features: Indexed<string | boolean> | null = null;
+	protected features: { [index: string]: string | boolean } | null = null;
 	protected monitor: SMTPResponse | null = null;
 	protected domain = hostname();
 	protected host = 'localhost';