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Re: spamcop blacklisting servers for misdirected DSN messages

True.  This approach relies on all mailservers' configuration being updated
the same.

> >This doesn't prevent the first attempt to reach a bad address,
> >but does prevent subsequent ones, because zmailer will
> >reject the message if the "to address" is contained in the
> >smtp-policy.spam file.
> One problem with this is that some backup MX's (e.g., hosted
> by the ISP) are misconfigured in such a way that they will say
> valid users do not exist, but the primary MX (e.g., hosted by
> the actual company) is correctly configured. So whenever the
> primary goes down, valid users will be flagged as invalid.

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