An email bounce describes the non-delivery of your email message. There are two different types of bounced emails.
Hard bounce indicates a permanent delivery issue to an address. It means that the email address is invalid and the email cannot reach the recipient’s mail server. Sender.net excludes hard bounce emails from any further campaigns automatically. The most common reasons for a hard bounce could be:
- A domain name does not exist or is not active anymore.
- Recipient’s email address does not exist.
Soft bounce indicates a temporary delivery issue to an address. It means that the email address is valid and the email reached the recipient’s mail server. If the email address continues to soft bounce in the same campaign, in Sender.net, that email address (soft bounce) is considered hard bounce after three attempts. The most common reasons for a soft bounce could be:
- Recipient’s email server is offline.
- Recipient’s mailbox is full.