> On Mon, 9 Nov 1998, Malcolm Ray wrote:
>
> > Using sender_host_reject or sender_net_reject, I can reject incoming
> > connections from particular hosts with a permanent failure. But under
> > some circumstances I'd like to be able to (temporarily!) reject some
> > connections with a 421 temporary failure. Is there a way to do this
> > with exim at present? I can't think of any. I'll contribute code
> > to do it if that's the case.
>
> Erm, what difference will it make? Is there an MTA that treats 5xx and
> 4xx responses on connection differently? I can't think of any logical
> thing to do other than retry again later, whatever the error. Keeping a
> record of hosts that have sent 5xx and never ever trying them again
> doesn't seem right - that give you/them no way of rescinding the block.
> I suppose one could try less frequently, but is it worth the effort?
Ok, let's put it another way. 554 is not among the list of reply codes
RFC 821 gives as permissible immediately after a connection is accepted,
but 421 is allowed. I'd be more comfortable using 421 there...
--
Malcolm Ray University of London Computer Centre
--
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