📧 Email / Phone Validator

Email Validation Levels: 1. Syntax Check: • Validates email format using RFC 5322 standards • Checks for valid characters and structure • Example: user@domain.com ✅, user@domain ❌ 2. Domain Check: • Verifies domain exists and is reachable • Checks DNS A and AAAA records • Identifies typos in domain names 3. MX Record Check: • Verifies mail exchange records exist • Confirms domain can receive emails • Checks mail server configuration 4. SMTP Validation: • Connects to mail server • Verifies mailbox exists (when possible) • Most accurate but may be blocked Phone Number Validation: • Format Validation: Checks number structure • Country Code: Validates international format • Carrier Information: Identifies mobile/landline • Geographic Location: Determines region/city • Number Type: Mobile, landline, VoIP, toll-free Common Email Patterns: • Gmail: username@gmail.com • Outlook: username@outlook.com, @hotmail.com • Yahoo: username@yahoo.com, @yahoo.co.uk • Corporate: firstname.lastname@company.com • Disposable: temp@10minutemail.com Phone Number Formats: • International: +1-555-123-4567 • National: (555) 123-4567 • E.164: +15551234567 • RFC 3966: tel:+1-555-123-4567 OSINT Applications: • Data breach investigation • Social media account discovery • Identity verification • Fraud detection • Contact information validation

Programming Examples: JavaScript: ```javascript // Email validation const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/; const isValidEmail = emailRegex.test(email); // Phone validation const phoneRegex = /^\+?[\d\s\-\(\)]+$/; const isValidPhone = phoneRegex.test(phone); ``` Python: ```python import re # Email validation email_pattern = r'^[^\s@]+@[^\s@]+\.[^\s@]+$' is_valid_email = re.match(email_pattern, email) # Phone validation phone_pattern = r'^\+?[\d\s\-\(\)]+$' is_valid_phone = re.match(phone_pattern, phone) ``` PHP: ```php // Email validation $is_valid_email = filter_var($email, FILTER_VALIDATE_EMAIL); // Phone validation $phone_pattern = '/^\+?[\d\s\-\(\)]+$/'; $is_valid_phone = preg_match($phone_pattern, $phone); ```