How to Reduce Your Email Bounce Rate: 9 Practical Steps
· 7 min read
A bounced email is a message that could not be delivered. A few bounces are normal, but a high bounce rate is one of the clearest signals inbox providers use to decide whether you are a careful sender or a spammer. Push it too high and even your best subscribers start finding your emails in spam.
This guide explains what a good bounce rate is, why emails bounce, and nine practical steps to bring your bounce rate down.
What is a good email bounce rate?
Your bounce rate is the number of bounced emails divided by the number of emails sent. As a rule of thumb:
| Bounce rate | What it means |
|---|---|
| Under 2% | Healthy. Keep doing what you are doing. |
| 2% to 5% | A warning sign. Clean your list before the next send. |
| Over 5% | Serious. Many email platforms will review or pause your account. |
Why emails bounce
There are two kinds of bounce. A hard bounce is permanent: the address or domain does not exist. A soft bounce is temporary: the mailbox is full, the server is busy, or the message is too large. You can read the details in hard bounce vs soft bounce. Hard bounces do the most damage, and almost all of them come from addresses that should never have been on the list.
9 ways to reduce your bounce rate
1. Verify your list before you send
The fastest fix is to check every address before a campaign. Bulk email verification confirms each mailbox with its mail server and removes the ones that would bounce, without sending anything to your contacts.
2. Never use bought or scraped lists
Purchased lists are full of outdated addresses, spam traps and people who never asked to hear from you. They cause bounces, complaints and blocklisting all at once.
3. Use double opt-in
Ask new subscribers to click a confirmation link. Anyone who mistyped their address, or typed a fake one, never makes it onto your list.
4. Check addresses at the signup form
Real-time verification catches typos like gmial.com while the person is still on the page and can fix it. The email verification API takes one request per signup.
5. Clean your list regularly
Lists decay as people change jobs and close old inboxes. Re-verify your whole list at least every three months, and always before mailing a segment you have not contacted in a while.
6. Remove hard bounces immediately
Most email platforms suppress hard bounces automatically, but check that this is switched on. Sending again to an address that already hard bounced is a red flag for inbox providers.
7. Handle catch-all and disposable addresses carefully
Disposable inboxes are throwaway addresses, so remove them from marketing lists. Catch-all domains and role addresses such as info@ are more likely to bounce or never engage, so send to them in a separate, smaller batch. Read what a catch-all email is to learn why.
8. Authenticate your domain
Set up SPF, DKIM and DMARC for your sending domain. Gmail and Yahoo require them for bulk senders, and unauthenticated mail is more likely to be rejected, which shows up as bounces.
9. Warm up new domains and IPs
If you are sending from a new domain or a new email platform, start with your most engaged contacts and increase volume over a few weeks. Sudden large sends from an unknown sender get throttled and bounced.
Quick checklist
- Verify the list before every large campaign.
- Use double opt-in and real-time checks at signup.
- Remove invalid and disposable addresses, review catch-all ones.
- Set up SPF, DKIM and DMARC.
- Keep your bounce rate under 2%.