Most mailing lists will produce an undeliverable mail rate ranging from 10% to 25%. The performance of a list is measured by its response rate. For example, a list may have a high undeliverable rate but still yield an acceptable number of responses if it is properly targeted.
Any undeliverable rate over 10% to 15% may be a cause for concern, but only if the list appears well-targeted and the response rate falls significantly below expectations.
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