📨 Build an Email Validation Tool with Python & Tkinter (Step-by-Step)

In this tutorial, we’ll build a desktop Email Validation Tool using Python + Tkinter. By the end, your app will: Validate email format using regex Check if the domain has MX records (can receive email) Keep a history of validated emails Export results to a .txt file Support light/dark mode Stay responsive using threading No advanced GUI knowledge required — we’ll go step by step. 📦 Step 1: Import Required Libraries Let’s start by importing everything we need. import sys import os import re import threading import tkinter as tk from tkinter import ttk, messagebox, filedialog import dns.resolver import sv_ttk What these are for: tkinter / ttk → GUI components re → email format validation threading → prevent UI freezing dns.resolver → MX record lookup sv_ttk → modern Tkinter theme 📌 Install missing packages: pip install dnspython sv-ttk 🛠 Step 2: Helper Functions Resolve file paths (useful for packaging later) def resource_path(file