Sending failed - message could not be delivered
Soft vs. Hard Bounces
When an email is rejected by an email server, it's called a bounce. There are different types of bounces that depend on the reason the email bounced.
A hard bounce indicates a permanent reason an email cannot be delivered. In most cases, bounced email addresses are cleaned from your audience automatically and immediately. Cleaned addresses will be excluded from all future campaign sends. Here are some common reasons an email may hard bounce.
- Recipient email address doesn't exist.
- Domain name doesn't exist.
- Recipient email server has completely blocked delivery.
Soft bounces typically indicate a temporary delivery issue and are handled differently than hard bounces.
While there are many reasons an email address may soft bounce, these are some common reasons this could happen.
- Mailbox is full (over quota).
- Recipient email server is down or offline.
- Email message is too large.