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Email Deliverability Best Practices

Want your emails to actually reach inboxes instead of spam folders? Here’s everything you need to know about email deliverability.

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🏠 Domain & DNS Setup

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SPF Record

Add this to your DNS to prevent spoofing: 
v=spf1 include:_spf.google.com include:_spf.posthoot.com ~all

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DKIM Authentication

Enable DKIM signing for your domain: 
# Generate DKIM key
openssl genrsa -out private.key 2048
openssl rsa -in private.key -pubout -out public.key

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DMARC Policy

Set up DMARC to monitor and protect your domain: 
v=DMARC1; p=quarantine; rua=mailto:dmarc@yourdomain.com

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📧 Email Content Best Practices

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Subject Lines

✅ Do:
  • Keep under 50 characters
  • Be specific and relevant
  • Use personalization: “Hey , your order is ready!”
  • Test different variations
❌ Don’t:
  • Use ALL CAPS
  • Include spam trigger words: “FREE”, “ACT NOW”, “LIMITED TIME”
  • Use excessive punctuation: ”!!!”
  • Be misleading or clickbait

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Email Body

✅ Do:
  • Use a clear, professional tone
  • Include your physical address (required by law)
  • Provide an unsubscribe link
  • Test on mobile devices
  • Keep HTML simple and clean
❌ Don’t:
  • Use excessive images (text-to-image ratio should be 80:20)
  • Include suspicious links
  • Use poor grammar or spelling
  • Send from “noreply@” addresses

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📊 List Management

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Clean Your List Regularly

// Remove bounced emails
const cleanList = async (emailList) => {
  const cleaned = emailList.filter(email => {
    return !email.bounced && !email.unsubscribed;
  });
  return cleaned;
};

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Double Opt-in

Always confirm subscriptions: 
// Send confirmation email
await sendEmail({
  to: user.email,
  subject: "Confirm your subscription",
  body: `Click here to confirm: ${confirmationLink}`
});

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Unsubscribe Handling

Make it easy to unsubscribe: 
<!-- Always include this -->
<p>Don't want these emails? <a href="{{unsubscribe_url}}">Unsubscribe</a></p>

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🚀 Sending Best Practices

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Warm Up Your IP

Start slow and gradually increase volume:
  • Day 1-7: 50 emails/day
  • Day 8-14: 100 emails/day
  • Day 15-21: 250 emails/day
  • Day 22+: 500+ emails/day

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Send at Optimal Times

Based on your audience:
  • B2B: Tuesday-Thursday, 9-11 AM
  • B2C: Tuesday-Thursday, 6-8 PM
  • Weekends: Avoid unless your audience is active

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Monitor Your Reputation

Track these metrics:
  • Bounce Rate: Keep under 2%
  • Spam Complaints: Keep under 0.1%
  • Open Rate: Aim for 20%+
  • Click Rate: Aim for 2%+

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🔧 Technical Setup

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SMTP Configuration

// Use proper SMTP settings
const smtpConfig = {
  host: 'smtp.gmail.com',
  port: 587,
  secure: false, // Use TLS
  auth: {
    user: 'your-email@gmail.com',
    pass: 'your-app-password'
  }
};

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Rate Limiting

Respect rate limits to avoid being flagged: 
// Implement exponential backoff
const sendWithBackoff = async (email, retries = 3) => {
  try {
    return await sendEmail(email);
  } catch (error) {
    if (error.status === 429 && retries > 0) {
      await new Promise(resolve => 
        setTimeout(resolve, Math.pow(2, 4 - retries) * 1000)
      );
      return sendWithBackoff(email, retries - 1);
    }
    throw error;
  }
};

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📈 Monitoring & Testing

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Test Before Sending

// Send test emails to yourself first
const testEmail = async () => {
  await sendEmail({
    to: 'your-email@domain.com',
    subject: 'Test Email',
    body: 'This is a test email'
  });
};

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Monitor Deliverability

Check these regularly:
  • Inbox Placement: Use tools like Mail Tester
  • Spam Score: Keep under 5/10
  • Authentication: Verify SPF, DKIM, DMARC
  • Blacklist Status: Check major blacklists

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🛠️ Tools & Resources

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Testing Tools

  • Mail Tester: Test email deliverability
  • GlockApps: Check spam score
  • 250ok: Monitor sending reputation
  • MXToolbox: Check blacklist status

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Monitoring Services

  • Postmark: Real-time delivery tracking
  • SendGrid: Detailed analytics
  • Mailgun: Bounce and complaint handling

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🚨 Common Mistakes to Avoid

  1. Buying Email Lists: Never buy lists - always grow organically
  2. Ignoring Bounces: Remove hard bounces immediately
  3. Sending Too Fast: Respect rate limits and warm up gradually
  4. Poor List Hygiene: Clean your list regularly
  5. No Authentication: Always set up SPF, DKIM, DMARC

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📞 Need Help?

If you’re still having deliverability issues:
  1. Check your sending reputation on major ISPs
  2. Review your email content for spam triggers
  3. Verify your DNS settings are correct
  4. Contact our support team for personalized help
Support: support@posthoot.com Community: Discord