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rswindell authoredacknowledgement ("250 OK") can be sent. In this case, the sender is either a spammer or it is a legitimate delivery attempt that has been aborted for some reason (e.g. timeout due to throttling).rswindell authoredacknowledgement ("250 OK") can be sent. In this case, the sender is either a spammer or it is a legitimate delivery attempt that has been aborted for some reason (e.g. timeout due to throttling).