The 2025 Email Deliverability Crisis

// Bulk validate your existing email list
const validateEmailList = async (emails) => {
  const results = [];

  for (const email of emails) {
    const params = new URLSearchParams({
      email: email,
      verifyMx: true,
      verifySmtp: true,
      detectToxic: true,
      riskScoring: true,
      suggestDomain: true
    });

    const response = await fetch(
      'https://api.email-check.app/v1-get-email-details?' + params,
      {
        headers: {
          'accept': 'application/json',
          'x-api-key': process.env.EMAIL_CHECK_API_KEY
        }
      }
    );

    const result = await response.json();

    // Categorize results for different handling
    if (result.validFormat && result.validSmtp && result.riskScore < 0.5) {
      results.push({ email, status: 'valid', data: result });
    } else {
      results.push({ email, status: 'invalid', reason: result.reason, data: result });
    }
  }

  return results;
};

// Add validation to all email collection points
const handleNewEmail = async (email, source) => {
  const validationResult = await validateEmail(email);

  if (!validationResult.validFormat || !validationResult.validSmtp) {
    throw new Error('Invalid email address');
  }

  if (validationResult.riskScore > 0.7) {
    // High-risk: Block or require manual review
    return {
      requiresReview: true,
      reason: 'High-risk email detected',
      suggestions: validationResult.suggestions
    };
  }

  if (validationResult.riskScore > 0.4) {
    // Medium-risk: Accept but monitor
    return {
      accepted: true,
      monitoringRequired: true,
      score: validationResult.riskScore
    };
  }

  // Low-risk: Accept normally
  return { accepted: true, validated: true };
};

// Implement in forms, CRM, and marketing automation
document.getElementById('email-form').addEventListener('submit', async (e) => {
  e.preventDefault();
  const email = e.target.email.value;

  try {
    const result = await handleNewEmail(email, 'webform');

    if (result.accepted) {
      // Proceed with form submission
      submitForm();
    } else if (result.requiresReview) {
      // Show additional verification steps
      showAdditionalVerification(result);
    }
  } catch (error) {
    // Show error to user
    showEmailError(error.message);
  }
});