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What is undeliverable mail and how should it be interpreted?

What is undeliverable mail and how should it be interpreted

Most mailing lists will produce an undeliverable mail rate from 25 – 10%. The performance of a list is measured by its response. For example, a list may produce a large number of undeliverable sends but it may also produce an acceptable number of responses if it is properly targeted.

Any quantity over 10% to 15% may be a cause for concern, but only if the list appears properly targeted and the response rate falls well below expectations.

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