Lähettäjä: Stuart Gall Päiväys: Vastaanottaja: David Saez Padros Kopio: exim-users, Andrew - Supernews, Ian Eiloart Aihe: Re: [exim] UCEPROTECT Blacklists and why callouts are abusive
On 18 Oct 2006, at 16:04, David Saez Padros wrote:
> Hi !!
>
>> You would not fill their mail boxes, the dsn would be rejected
>> after rcpt to: so in fact the session would be indistinguishable
>> from a callout.
>> except you will probably retry.
>
> then doing a callout is the same as bouncing except that with the
> callout the first message is not received and the bounce not
> generated. This is a saving for the site doing the callout and
> exactly the same thing for the site receiving the callout.
No because callouts are cached, in general, for much longer than a
DSN failure would be.
also you might amass hundreds of DSNs on the queue - frozen these
will be retried (albeit once per user) until they have all expired.
You will definitely get many more connections from frozen DSNs.
There is also the advantage that you are rejecting the spammers
emails further back up the chain making it more likely they annoy
someone in a position to put a stop to them. And that is of benefit
to everyone.
