Secure Email Validation for FinTech:
The Foundation of Trust

// security-conscious email validation for financial services
async function validateCustomerEmail(email, customerData) {
 const params = new URLSearchParams({
 email: email,
 verifyMx:'true',
 verifySmtp:'true',
 detectName:'true',
 suggestDomain:'true',
 checkDomainAge:'true',
 checkDomainRegistration:'true'
 });

 const response = await fetch(`https://api.email-check.app/v1-get-email-details?${params}`, {
 method:'GET',
 headers: {
'accept':'application/json',
'x-api-key':'YOUR_FINTECH_API_KEY',
'X-Security-Reviewed':'true',
'X-Financial-Context':'customer-onboarding'
 }
 });

 const result = await response.json();

 // Transform result for financial services use
 const validationResult = {
 valid: result.validFormat && result.validMx && result.validSmtp,
 isDisposable: result.isDisposable,
 riskScore: result.isDisposable ? 0.9 : 0.1, // Risk based on disposable status
 details: result
 };

 // Create audit trail for compliance
 await createComplianceLog({
 customerId: customerData.id,
 email: email,
 validationResult: validationResult,
 timestamp: new Date().toISOString(),
 ipAddress: customerData.ipAddress,
 deviceFingerprint: customerData.deviceId
 });

 return validationResult;
}

// Email validation for MFA setup
async function setupMFA(userId, email) {
 // First validate email for MFA compatibility
 const validation = await validateCustomerEmail(email, {
 id: userId,
 context:'mfa_setup'
 });

 if (!validation.valid || validation.riskScore > 0.7) {
 throw new Error('Email not suitable for MFA');
 }

 // Generate and send MFA code
 const mfaCode = generateSecureCode();
 await sendMFACode(email, mfaCode);

 // Store encrypted MFA session
 await storeMFASession({
 userId,
 email: encrypt(email),
 codeHash: hash(mfaCode),
 expires: Date.now() + 300000 // 5 minutes
 });
}