[Mimedefang] Re: Justifying greylisting to management

[Tomasz Ostrowski]

On Wed, 01 Mar 2006, David F. Skoll wrote:

> > This could be avoided if sendmail would tempfail "data" requests if
> > any "rcpt to" request tempfailed and every "rcpt to" request tempfailed
> > or permfailed.
> 
> But the RFC says that an SMTP client MUST NOT issue a DATA command unless
> at least one RCPT succeeded, so Sendmail is within its rights to issue
> a 5xx failure code.

Of course.

But it is also within its rights to issue 4xx. And if it makes it
more reliable then why not?

This would not encourage the developers of broken servers to fix them
or administrators to migrate. But it could be better than tempfailing
after "data" because tempfailing "rcpt to" sometimes does not work -
it will not waste bandwidth.

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