Taken from an article in the news.admin.net-abuse.email newsgroup.
spamtrap@??? writes...
[re: the use of Return-Receipt-To: headers]
> >Why is it an "attractive nuisance" that you think shouldn't be honored
> >until authenticated email is common? I can understand somewhat the
> >bandwidth-usage issues, but security?
>
> OK. I send a million messages to a million addrress with a From of
> postmaster (at) crl (dot) com, with a Return-Receipt-To of the same. What
> happens if all million of them honor it? The potential for mail bombing is
> just too high.
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