diff --git a/src/admins/dto.ts b/src/admins/dto.ts
index adbefcb..8ec591a 100644
--- a/src/admins/dto.ts
+++ b/src/admins/dto.ts
@@ -1,3 +1,4 @@
+import { Transform } from 'class-transformer';
 import { IsArray, IsBoolean, IsEmail, IsEnum, IsOptional, IsString, IsUUID, MinLength } from 'class-validator';
 import { AdminRole } from './admin-role';
 
@@ -24,6 +25,7 @@ export class ListAdminsQuery {
 }
 
 export class CreateAdminDto {
+  @Transform(({ value }) => typeof value === 'string' ? value.trim().toLowerCase() : value)
   @IsEmail()
   email!: string;