On Sun, 21 Sep 2025, Paul Kosinski via clamav-users wrote:
So, what I am doing is setting up ClamAV on a small (but powerful)
computer and running clamd on it so as to receive the mail contents
to be scanned via a TCP port. (This might not be practical for a
commercial email service, but the email volume associated with home
use is pretty small.)
The problem I run into is that, although clamd.conf allows one to
specify a port number and even an an IP address for clamd to bind
to, there seems to be no way -- such as a command-line option -- to
specify what IP address clamdscan should talk to. (This makes the
clamd binding address almost irrelevant, I think.)
That is a surprise.
Over the years people have suggested running a dedicated clamav server
for all the machines in a network, bu like you I now cannot find any
documentation on how to tell clam to talk to a remote server.
This is probably a red-herring, but IIRC there used to be a third option
in addition to fdpass and streaming.
The Exim docs describe how to configure Exim to talk directly to a
(pool of) remote clamd server(s). Does Postfix have a similar option ?
The only thing I can think of, other than modifying clamdscan's
internals (a possibly risky business), is to replace the regular
clamd on the Postfix computer by a trivial mechanism that simply
listens on localhost:3310 (for example) and forwards the TCP (via
netcat or xinetd) to the ClamAV computer running the real clamd
which listens on 10.23.45.67:3310 (for example).
Might there be a better way to do this? (I briefly thought of
setting up a VM or a "container" on the current server running
Postfix et al, and running the latest ClamAV therein, but that would
still require a quite disruptive upgrade of the software
environment.)
--
Andrew C. Aitchison Kendal, UK
[email protected]
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