Know the Difference Between Hard Bounce and Soft Bounce

Boost Inbox Logo Maria Oscar
June 13, 2025
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Know the Difference Between Hard Bounce and Soft Bounce

Emails do not always reach the inbox. This is known as an email bounce. When many emails bounce, it causes email delivery issues. Your email bounce rate becomes high. This is terrible for your sender reputation. It can prevent future emails from being delivered. Understanding the difference between a hard bounce and a soft bounce is really useful. It walks you through the steps of sending emails appropriately. You could be sending school updates or business messages. This instruction will make everything obvious and straightforward. You will discover what bounces are, why they occur, and how to prevent them. Even a ten-year-old can enjoy reading this!

What Happens When an Email Bounces?

When an email bounces, it signifies that it did not reach its intended recipient. This is known as email delivery failure. You will receive a bounce notification to inform you. It's also called a non-delivery report (NDR). This message explains why your email failed. It helps you determine what went wrong. If this behavior continues, the quantity of bounced emails will increase. That is not good. Too many bounces can harm your email reputation. It is critical to investigate and resolve the issue described in the notification. This improves how well your emails are delivered the following time.

What is a Hard Bounce?

What is a Hard Bounce?

A hard bounce is when an email cannot be delivered at all. It is known as a perpetual bounce. This indicates that the email is never returned. It will not reach the intended recipient. These are hard bounce emails. When this occurs, you must remove the email address from your database. Sending it again won't work. It could potentially harm your email reputation. Hard bounces indicate that something is terribly wrong with the email address. It is critical to address this by cleansing your list frequently. This protects your emails safe and ensures that they reach the intended recipients.

Common Reasons Why Hard Bounces Happen

Hard bounces occur for a variety of reasons. The majority of them are straightforward. However, they can influence how many emails are delivered. The following are some of the leading causes. Knowing these helps you avoid mistakes and keep a clean list.

The Email Address Doesn’t Exist

This is frequently the result of hard bounces. Sometimes the email address is not valid. Perhaps it was deleted. Perhaps it never existed. This is known as a non-existent email or an unidentified user. These are also known as invalid email addresses. If you send a message like this, it bounces. That is why reviewing your list is critical. Check that all emails are correct and still operating. Removing problematic emails might help keep your bounce rate low.

Your Email Got Blocked by the Server

Sometimes the email address is correct, but the server says no. This is known as a blocked delivery. It may occur due to server policy. Some email servers prohibit specific sorts of emails. This is known as email blocking. The server may think your email is spam. Perhaps it doesn't trust your sender address. This permanently disables your email. That is why it is important to obey email guidelines. Make sure your emails are clean, straightforward, and honest. That way, they won't get blocked.

The Email Address is Invalid or Wrong

Typos are a major cause of hard bounces. Even little errors, such as inputting ".con" instead of ".com", can result in a bounce. These are known as mistakes in email addresses. Some people also utilize bogus email addresses. These are not real and always bounce. That is why you need email validation. It checks whether the address is correct. Always double-check your email addresses. This will stop hard bounces before they happen.

What is a Soft Bounce?

What is a Soft Bounce?

A soft bounce occurs when your email almost reaches the inbox. This is a short delivery issue. This indicates that the email may still be delivered later. It isn't like a hard bounce. Soft-bounced emails are typically caused by minor issues that can be resolved. These difficulties do not stay forever. This is why it's called a soft bounce. Your email may arrive after the problem is resolved. It's critical to understand soft bounces so you can try sending the message again later. Now, let's look at some of the most typical reasons for soft bounces.

Common Reasons Why Soft Bounces Happen

Soft bounces can occur for a variety of causes. The majority are transient. Once corrected, your email may be delivered. These are some of the most common causes of soft bounces.

The Mailbox is Too Full

Sometimes the individual's mailbox is full. This means that it has exceeded its capacity limits. There is no more space for fresh messages. If you send an email around that time, it will bounce. The system will retry later. This is common with dormant mails that aren't examined often.

The Email Message is Too Big

Some emails are simply too huge. This is referred to as exceeding the email size limit. If the communication contains too many photos or files, it may be too big to send. These huge emails frequently bounce back. You can fix it by reducing the file size. To avoid exceeding the message size restriction, try using less text or fewer photos.

Server Problems or Downtime

The email server is not always available. This means there will be server downtime. If the email server is overcrowded or unavailable, your message will not be delivered. It will bounce till the server becomes active again. If everything functions properly, the message can be delivered.

Spam Filters Blocked Your Email

Spam filters may potentially block your emails. This is known as a spam-triggered bounce. Your email may reach the server, but it is tagged as spam. Then it gets blocked and bounced. These email-blocking issues are frequent. To avoid this, send precise and concise emails. Avoid using spammy language or too many links.

Auto Reply Messages (Out of Office)

If someone has enabled auto-reply messages, such as an out-of-office notice, your email may bounce. These automated responses can cause confusion in the system. It may consider it a delivery issue. But don't worry, the message might still get through later. This type of bouncing is not a serious issue.

Difference Between Hard Bounce and Soft Bounce – Key Points

Difference Between Hard Bounce and Soft Bounce – Key Points

Understanding the distinction between severe and mild bounce is crucial. These two types of bounces impede email delivery.  Let's put it simply. This guide teaches you how they work and what you should do next. It also demonstrates you how to manage each bounce categorization correctly.

How Long They Last

A hard bounce indicates a persistent delivery failure. This indicates that the email will never reach the recipient. The issue cannot be resolved. You must remove the email address. 

A soft bounce is a brief failure. It may be fixed soon. Sometimes the email arrives after 24 to 72 hours. The bounce duration is short, so you may not need to do anything.

Can You Fix Them?

You cannot repair a hard bounce. The address is invalid. You should remove it from your list. In most circumstances, you can repair a mild bounce. You may try again later. Alternatively, alter the email size. These are simple resending strategies. They are examples of good email retry best practices. Email list cleaning also helps to remove spam and fraudulent emails.

What Should You Do?

Take quick action while dealing with hard bounces. Delete the email straight now. This helps to protect your email list. It also saves your sending score. 

Wait and try again if you want mild bounces. Observe what happens. If the bounce occurs frequently, delete the address later.Using smart email bounce tools allows you to track these issues. Good bounce management and delivery analytics ensure that your emails are delivered to the inbox rather than being lost. Knowing how to handle both sorts of bounces will greatly improve the effectiveness of your email campaign.

Why Understanding the Difference Between Hard Bounce and Soft Bounce Matters

Why Understanding the Difference Between Hard Bounce and Soft Bounce Matters

Understanding the distinction between a strong bounce and a gentle bounce improves your email strategy. Bounces affect the effectiveness of your email campaigns. When your emails bounce frequently, they may never reach the people you want to communicate with. If you want to be successful with email marketing, you must track and fix bounces as soon as possible.

How Bounces Hurt Your Email Success

Bounces might cause major delivery concerns. This suggests that fewer of your emails end up in inboxes. If too many emails bounce, it can undermine your sender's reputation.  Email services track your bounce rate. A high rate indicates something is wrong. This can have a detrimental impact on the overall effectiveness of your campaign. Even legitimate emails may be blocked due to previous bounces.

Problems Bounced Emails Create

Bounced emails can harm your email marketing. They lower delivery rates and harm the sender's reputation. These difficulties have an impact on how effectively your emails reach inboxes. Fixing them is critical.

Fewer People Get Your Emails

When an email bounces, it means the message was not sent. These are referred to as undelivered emails. This reduces your email reach. It also influences inbox placement, which means fewer people see your letter. You miss a chance to engage with your audience.

Your Emails Might Go to Spam

Too many bounces can make your emails appear terrible to spam filters. Your next email might end up in the spam bin. This is known as email filtering. It harmed your reputation. Even those who are interested in receiving your messages will not trust them. Learning spam protection can help you maintain your email reputation.

You Lose Contact with Customers

A bounce can signify a breakdown in contact with a customer. Your primary means of communication is via email. If your communication bounces, the customer will not see it. You miss the opportunity to assist them, provide news, or answer queries. That terminates your email communications. It undermines your consumer outreach and brand. 

Understanding and resolving email bounces helps your campaigns perform better. It fosters confidence and keeps your emails out of spam. Checking bounces, keeping a clean list, and tracking email campaign deliverability will help you ensure that more individuals receive your communications.

How to Fix Hard Bounce Problems

How to Fix Hard Bounce Problems

To resolve hard bounce issues, you must maintain your email list properly. A hard bounce means the email will never be delivered. That email address no longer works. You should eliminate invalid addresses immediately soon. This helps to protect your sender score. Handling hard-bounced addresses correctly keeps your emails out of spam.

Best Ways to Handle Hard Bounced Emails

There are clever ways to deal with bounced emails. Here are the finest tips to follow.

Remove Bad Email Addresses Right Away

If an email repeatedly bounces, remove it from your list as soon as possible. This is known as keeping a clean email list. These emails will never function. Keeping them will make your email list less clean. You can also use automated list removal applications.These programs will discover and eliminate harmful emails for you.

Check Your Email List Regularly

Make it a habit to check your list every week or month. Use list verification tools to assist. These tools will alert you whether an address is fraudulent or no longer functional. This helps you keep track of your email list. When you update your email list on a regular basis, you can prevent problems from becoming worse.

Use Good Email Collection Methods

When adding persons to your list, make sure you follow the proper processes. Use the double opt-in technique. This implies the person registers and then verifies by email. It aids in the prevention of fraudulent email addresses and typographical errors. A good opt-in procedure improves your list from the start. Also, ask people to confirm their subscriptions. This keeps your list clean and secure. 

Follow these easy ways to reduce your bounce rate. You will only send emails to genuine persons. That means higher open rates and greater trust. Fixing hard bounces helps your email campaigns remain healthy and professional. For optimum performance, keep your list clean and up to date.

How to Fix Soft Bounce Problems

How to Fix Soft Bounce Problems

Fixing soft bounce issues is critical for improving email delivery. A soft bounce occurs due to momentary email difficulties. That indicates your email did not go through, but it may work if you try again later. These bounces are typically caused by trivial faults or temporary issues. Knowing the causes of soft bounce allows you to fix them quickly. Soft bounce conversion is the process of converting a soft bounce into a successful delivery by taking the proper steps.

Best Ways to Handle Soft Bounced Emails

Here are some simple and effective solutions for emails that gently bounce. These techniques will help you enhance your email performance.

Try Sending the Email Again Later

Sometimes the issue is merely a temporary blip. Perhaps the email server is overloaded or the mailbox is full. In this instance, retry later. Most email systems will retry within 24 to 72 hours. This usually works. If you're doing it manually, follow good email retry advice. Wait some time before sending your email again.

Make Your Emails Smaller

Large emails may bounce. This is why email size optimization is critical. Make your email smaller by deleting large files. Compress attachments to minimize their size. Also, avoid huge graphics or excessive design. These email content changes will help your message stay inside the size restriction. For optimal results, keep files under 10MB or 110KB in size.

Check Your Email Content for Spam Words

Spam filters can reject your email even if everything else is fine. So utilize non-spam stuff. Avoid using phrases like "free," "buy now," or "act fast." These are spam triggering words. They also cause soft bounces. Make sure your content is clean and helpful. Use content optimization tools to test your message. This form of spam testing ensures that your email seems safe to email providers. 

By addressing these soft bounce issues, your emails are more likely to be delivered. These simple steps will help you improve your email marketing performance. Keep your emails clean, clear, and timely. That's the key to improving inbox delivery.

How to Stop Email Bounces Before They Happen

How to Stop Email Bounces Before They Happen

The easiest method to address email bounces is to prevent them from occurring in the first place. This is known as proactive bounce management. Using preventive techniques ensures that your emails reach the intended recipients every time. Smart steps can reduce the likelihood of both hard and soft bounces. You can also use email validation tools to verify addresses before sending. This saves time and secures your email campaign.

Smart Ways to Prevent Both Hard and Soft Bounces

There are easy ways to protect your emails. These tactics will help you enhance your email success.

Use Double Opt-in for New Subscribers

Instruct new users to confirm their email addresses by clicking a link. This process is known as subscriber confirmation. It aids you in avoiding false or incorrect email addresses. When individuals confirm, it implies they genuinely want to hear from you. This is an example of permission-based marketing. It increases trust and reduces bounce rates. A validated opt-in indicates that your list is clean from the start.

Clean Your Email List Every Month

Old or inactive emails may bounce. This is why email list hygiene is so crucial. Clean up your list at least once a month. Remove emails that no longer work. This is effective bounce list management. It allows your emails to reach real individuals. When you delete recipients who cause bounces, your sender reputation will improve.

Test Your Emails Before Sending

Check your emails before sending them. Send test messages first. Check the spam score, file size, and broken links. These test runs are part of the email analytics and testing programs. You can also use email performance monitoring tools to see whether your message will be blocked or filtered into spam.

Set Up Proper Email Authentication

Set up email security features such as SPF, DKIM, and DMARC. These allow email servers to trust your communications. If you don't have these, your emails may bounce or go into spam. These tools secure your domain and demonstrate that you are a legitimate sender. 

Taking these steps helps to prevent problems from occurring. You secure your sender name, increase your inbox rate, and keep your audience satisfied.

Quick Checklist to Reduce Email Bounces

Quick Checklist to Reduce Email Bounces

If you want to improve your email outcomes, follow this simple checklist. This checklist can help you stop bounces before they harm your email campaign. Use bounce monitoring to identify problems early. Follow bounce rate benchmarks to determine when your stats are excessively high. Using the correct deliverability tools makes your job easier and more effective. These technologies allow your emails to reach more individuals.

Daily Tasks to Prevent Bounces

You should check your email every day. Begin by measuring bounce rates. If an email bounces, act quickly. Use real-time bounce alerts to detect problems right immediately. This allows you to eliminate hard-bounced addresses before they create more issues. Also, consider bounce categorization. It shows you if the bounce is momentary or permanent.

Weekly Tasks to Keep Your List Clean

Take time each week to clean your list. Use email verification tools to determine which email addresses are still active. This aids in the removal of fraudulent or incorrect emails. Check for patterns in gentle bounces. If the same address repeatedly bounces, it may be time to eliminate it. This is part of the process for removing inactive subscribers. Keep your list clean by following these steps on a weekly basis. It's the most effective technique to clear your email list before it causes problems.

Monthly Tasks for Better Email Health

At least once a month, dig deeper. Begin with engagement tracking. Consider who opens your emails and who does not. Then perform list segmentation. This entails categorizing active users in one category and inactive users in another. This allows you to send more relevant material to each group. Additionally, practice subscriber maintenance. Remove any people who haven't clicked or opened in a long time. Finally, verify your email settings. Review your SPF, DKIM, and DMARC settings. This helps to keep emails from bouncing or going to spam.

By following this fast checklist, you may reduce your bounce rate and keep your email campaigns going strong. Daily, weekly, and monthly habits all have an impact. With a little effort, your communications can reach more inboxes. It also helps your sender name remain trustworthy. So make this checklist a part of your email routine. It's simple, yet effective!

Final Thoughts on the Difference Between Hard Bounce and Soft Bounce

Knowing the difference between email bounce kinds is critical. A severe bounce indicates that the address is faulty and should be removed straight once. A mild bounce is only fleeting. You can repair it by attempting again, shortening the email, or modifying the text. This email bounce definition will help you maintain your list clean. It also helps your emails reach a larger audience. Good list hygiene increases campaign deliverability impact. Always acquire valid email addresses. Before sending your emails, make sure they are working properly. Use email checks such as SPF and DKIM. These simple actions can help you protect your email reputation and achieve success.

Frequently Asked Questions About Hard and Soft Bounces

Frequently Asked Questions About Hard and Soft Bounces

What’s the Main Difference Between Hard Bounce and Soft Bounce?

A hard bounce indicates that the email cannot be delivered at all. A gentle bounce indicates that it has failed for now. These bounce categories represent several bounce reasons in email bounce tracking.

How Can I Tell if My Email Had a Hard or Soft Bounce?

Check your bounce message or Non-Delivery Report (NDR). A 5XX email server response indicates a hard bounce. A 4XX indicates soft bounce. Logs reveal if it is temporary or permanent.

Should I Delete All Bounced Email Addresses?

Yes for hard bounces—remove immediately. For gentle bounces, retry several times. If it continues to bounce, remove it.

How Many Bounces is Too Many?

High bounce rates are undesirable. To avoid difficulties, keep the percentage below 2%. Going over that bounce threshold may result in the three-strike rule, harming your sender reputation.

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