function calculateBounceRate() {
// Get input values using var
var totalSentInput = document.getElementById('eb_total_sent');
var hardBouncesInput = document.getElementById('eb_hard_bounces');
var softBouncesInput = document.getElementById('eb_soft_bounces');
var resultBox = document.getElementById('eb_result');
var totalSent = parseFloat(totalSentInput.value);
var hardBounces = parseFloat(hardBouncesInput.value);
var softBounces = parseFloat(softBouncesInput.value);
// Validation logic
if (isNaN(totalSent) || totalSent totalSent) {
alert("Total bounces cannot exceed the total number of emails sent.");
return;
}
// Calculation Logic
var totalBounceRate = (totalBounces / totalSent) * 100;
var hardBounceRate = (hardBounces / totalSent) * 100;
var softBounceRate = (softBounces / totalSent) * 100;
var deliveryRate = 100 – totalBounceRate;
// Display Logic
document.getElementById('res_total_rate').innerText = totalBounceRate.toFixed(2) + '%';
document.getElementById('res_hard_rate').innerText = hardBounceRate.toFixed(2) + '%';
document.getElementById('res_soft_rate').innerText = softBounceRate.toFixed(2) + '%';
document.getElementById('res_delivery_rate').innerText = deliveryRate.toFixed(2) + '%';
// Show result box
resultBox.style.display = 'block';
}
Understanding Email Bounce Rate
Email bounce rate is a critical metric for email marketers, representing the percentage of email addresses in your subscriber list that did not receive your message because it was returned by a recipient mail server. Maintaining a low bounce rate is essential for ensuring your sender reputation remains high and your campaigns reach the inbox rather than the spam folder.
The Formula
The bounce rate is calculated using a straightforward formula:
For example, if you send 10,000 emails and 200 of them bounce, your bounce rate is 2%.
Hard Bounces vs. Soft Bounces
Understanding the difference between hard and soft bounces is vital for list hygiene:
Hard Bounce: This indicates a permanent reason for delivery failure. Common causes include invalid email addresses (typos, domain doesn't exist) or the recipient server has blocked your email server. Hard bounced addresses should be removed from your list immediately.
Soft Bounce: This indicates a temporary delivery failure. This can happen if the recipient's mailbox is full, the server is down, or the message is too large. Most email service providers will attempt to resend these messages for a period of time before classifying them as failed.
What is an Acceptable Bounce Rate?
While benchmarks vary by industry, a bounce rate under 2% is generally considered healthy. If your bounce rate exceeds 2%, you should investigate your list gathering practices immediately. Rates above 5% to 10% can lead to your account being suspended by your Email Service Provider (ESP) or your domain being blacklisted by major ISPs.
How to Reduce Your Bounce Rate
To improve your email deliverability and lower your bounce rate, consider the following strategies:
Use Double Opt-In: Require new subscribers to confirm their email address before being added to your list. This prevents typos and fake emails.
Clean Your List Regularly: Remove inactive subscribers who haven't opened an email in 6 months or more.
Verify Your Domain: Ensure you have set up DKIM, SPF, and DMARC records to authenticate your emails.
Avoid Spammy Content: Avoid using excessive capitalization, misleading subject lines, or too many links, which can trigger spam filters that reject the email.