jetkins writes "In an email to subscribers, DynDNS announced that they will no longer deliver locally generated non-delivery reports (NDRs) from any MailHop systems. MailHop is a multi-faceted service offering in- and outbound relay services, spam and virus filtering, and store-and-forward buffering. DynDNS makes it clear that they are aware that this goes against RFC 2821 Section 3.7, but explains that in their opinion the increase in spam volume, and the use of NDRs as a spam vector, means that the value of NDRs is now far outweighed by their potential for harm. (DynDNS also points to the far greater reliability of email systems now than when the RFC was approved.) The company notes that other ISPs have quietly dropped RFC 2821-compliant NDRs. Will their public move start a flood (mutiny) of ISPs following suit? Should they have made efforts to have the standard changed instead of defying it?"
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