On Sat, 1 Jan 2005, Alan J. Flavell wrote:
>
> But AIUI it takes no particular cacheing action if the callout gets
> 4xx-ed.
The vast majority of deferrals from callouts are caused by
misconfigurations at the sending site (e.g. MAIL FROM:<apache@www> and the
webserver is firewalled off or not running an smtpd) so the cost is mostly
born mostly by the recipient of the junk rather than the alleged sender.
Tony.
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