diff --git a/packages/mail/src/mail.d.ts b/packages/mail/src/mail.d.ts
index fa827498d..1b4dba6f0 100644
--- a/packages/mail/src/mail.d.ts
+++ b/packages/mail/src/mail.d.ts
@@ -32,7 +32,8 @@ declare class MailService {
   /**
    * Send email
    */
-  send(data: MailDataRequired | MailDataRequired[], isMultiple?: boolean, cb?: (err: Error | ResponseError, result: [ClientResponse, {}]) => void): Promise<[ClientResponse, {}]>;
+  send(data: MailDataRequired, isMultiple?: boolean, cb?: (err: Error | ResponseError, result: [ClientResponse, {}]) => void): Promise<[ClientResponse, {}]>;
+  send(data: MailDataRequired[], isMultiple?: boolean, cb?: (err: Error | ResponseError, result: [ClientResponse, {}]) => void): Promise<[ClientResponse, {}][]>;
 
   /**
    * Send multiple emails (shortcut)