There are four different categories of bounces – hard, soft, spam, transient, auto responder and others.

Hard bounce means that the recipient address does not exist (eg the domain has ceased to exist or the e-mail address is misspelled).

Soft bounces are temporary bounces, such as a full inbox.

Spam is when the recipient’s spam filter thinks that the message should be classified as spam and therefore the send out is not delivered to the recipient.

Transient is a temporary bounce. The server was down when we tried to send and we could not deliver the email within 4 days.

Auto responder means e.g. out of office notifications or notification that the recipient has left work or changed email address.

Other bounces end up with the bounces that Lime Marketing cannot interpret, where the bounce code and text deviate from the standard.