> Basically I suppose it's a risk of having a domain which is likely to
> have other domains with similar names, it's also a risk which is
> likely to increase as the net becomes bigger.
Whole life is a risk.

> Is there a way to ask qmail to send warning messages (to the user or
> to the postmaster) when such deferrals occur? 
Yes, there is a program call qmail_bounce. Look at www.qmail.org for
Brian T. Wightman and his delayed mail notifier.

Regards, Frank

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