Hard Bounce vs Soft Bounce: What Is the Difference?
Learn the difference between hard and soft email bounces and why the distinction matters when cleaning an email list.
Not every rejected email means the same thing. The distinction between a hard bounce and a soft bounce helps you decide whether an address should be removed immediately or monitored for a temporary problem.
What is a hard bounce?
A hard bounce is generally a permanent failure. Typical causes include a mailbox that does not exist, an invalid domain or another condition indicating that future attempts are unlikely to succeed. These addresses are strong candidates for removal from active campaign lists.
What is a soft bounce?
A soft bounce is generally temporary. The mailbox may be full, the destination server may be unavailable or the receiving system may temporarily defer the message. One soft bounce is therefore not the same signal as a permanent invalid-address response.
Why classification matters
If every temporary failure is removed immediately, you can lose valid contacts. If permanent failures are repeatedly retried, you waste sending resources and keep poor-quality data in the list. Good list hygiene depends on treating the two situations differently.
Where verification helps
Email verification can identify many technical risks before a campaign. It can also flag uncertain situations where the destination server does not provide a definitive answer. Verification should complement, not replace, bounce information from your sending platform.
Use Servyona to check your email list before sending. For more context, read our guide to SMTP 550 errors.
À lire aussi : How to Reduce Email Bounce Rate Before a Campaign.
À lire aussi : Email List Cleaning: Why It Matters for Deliverability.