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3.4 Send Non Delivery Reports

It is possible, that the MTA accepts initially the email for all recipients and delivers later non-delivery reports from the recipients, not willing to accept the email.

The disadvantage is, that non-delivery reports (bounces) can blacklist the IP address of the server. However, when aegee-milter is used with the MSA, the NDR are send only to local users and there are no bad side effects.