

What are hard bounces?

Hard bounces are caused by email addresses or domain names that no longer exist, or they're unrecognised by the ISP - most likely due to DNS (Doman Name Service) issues.  If your campaign has a large number of hard bounces this usually indicates the email address list is of poor quality or not maintained well enough.


What are soft bounces?

A soft bounces, are produced by a temporary issue with the recipient's inbox (e.g. mailbox full, out of diskspace etc).  Soft bounces will often retry sending and you will see these as "deferred" messages on a mail queue.  When looking at the MXTools logs, if you see a deferred message in the log entry there is normally an explaination of why it's deferred.

The golden rules for bounce backs

The golden rules for bounce backs when running your email marketing campaign are:





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