On 2023-06-03, Slavko via Exim-users <exim-users@???> wrote:
> Dňa 3. júna 2023 20:29:11 UTC používateľ Julian Bradfield via Exim-users <exim-users@???> napísal:
>
>>Nonetheless, I think that a pipeline should be aborted if you already
>>know that the far end is closed.
>
> IMO you are confused. That RCPT rejection was logged,
> doesn't mean that it was send, and even if, i am sure that
> attacker will not receive it.
Exim knows the pipeline is closed because that's what causes the
cancellation of the delays.
> IMO if exim will not process all received commands and log
> rejections, important info can be lost (eg. ratelimits, stats,
> etc). Anyway, if you care about output flushing on delays,
> there is control option to manage that. IIRC the PIPELINE is
> exactly mentioned in its description...
True. Indeed, the docs for delay say that SMTP output is, by default,
flushed before the delay, even in pipelining mode, so now I no longer
understand why exim doesn't detect the closed stream on the first
delay ...
> BTW, the RBLs are good not only for rejection, but eg. to
> disable PIPELINING for suspicious hosts too...
I've never used external blacklists (because I don't trust other
people to make my spam decisions for me), but that would be a harmless
use for them. Thanks for the tip!
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