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Re: Defaulting to no mail

2008-03-30 20:42:52

--On Sunday, March 30, 2008 4:10 PM +0200 Arnt Gulbrandsen <arnt(_at_)oryx(_dot_)com> wrote:

There is another argument: A fair amount of software
constructs email addresses, most notably

     Sender: something(_at_)hostname


    MAIL FROM:<something(_at_)hostname>

The best I can say for these addresses is that they're
syntactically valid. It would be a great joy to me if all the
muckware would stop assuming that blah(_at_)hostname is a
deliverable email address.

Of course, the firm requirement in 2821 that all domains in email addresses be fully-qualified, plus either a little knowledge or a quick determination that "hostname" is not a TLD, is sufficient to reject such messages as non-deliverable as soon as they touch the mail system and possibly earlier. The fact that those rejections do not occur often enough may be more evidence about the futility of trying to fix these sorts of problems by fine-tuning standards.