fix: add sending form data

src/shared/config/core.ts

@@ -0,0 +1,7 @@
+export const CORE = {
+  MAIL_USER: process.env.MAIL_USER,
+  MAIL_PASS: process.env.MAIL_PASS,
+  MAIL_FROM: process.env.MAIL_FROM,
+  MAIL_TO: process.env.MAIL_TO,
+  MAIL_SECURE_KEY: process.env.NEXT_PUBLIC_MAIL_SECURE_KEY,
+} as const;