On 23/07/2023 11:04, Paweł Zuzelski via Exim-users wrote:
> Is it possible for Exim to drop the TCP connection instead of properly
> rejecting the message? I don't see any option like that in ACLs.
No. Exim really operates at SMTP and TLS levels rather than TCP.
Also: if you did a proper close on the TCP connection (to release
resources at your end) this will inform the peer, letting them
release their resource. You are asking, effectively, for a
firewall-level action.
> For some connections (like obvious attempt to send spam or probing for
> open relays) I would like Exim to just drop the connection without ever
> properly closing it, so that the client wastes memory waiting for the
> time out.
Why not just delay, with the SMTP connection held open.
Spammers do tend to time out their ends pretty quickly;
unless you are a high-volume site the resource at your end is
not large.
--
Cheers,
Jeremy
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