diff --git a/lib/interfaces/send-mail-options.interface.ts b/lib/interfaces/send-mail-options.interface.ts
index 283ef996..1360b350 100644
--- a/lib/interfaces/send-mail-options.interface.ts
+++ b/lib/interfaces/send-mail-options.interface.ts
@@ -20,7 +20,7 @@ export interface ISendMailOptions extends SendMailOptions {
   to?: string | Address | Array<string | Address>;
   cc?: string | Address | Array<string | Address>;
   bcc?: string | Address | Array<string | Address>;
-  replyTo?: string | Address;
+  replyTo?: string | Address | Array<string | Address>;
   inReplyTo?: string | Address;
   from?: string | Address;
   subject?: string;