Niklaas Baudet von Gersdorff:
> On FreeBSD, syslog cannot filter according to the log message
> content. So I'm wondering whether there is something I can do on
> Postfix's side not to log connection from a specific IP/from
> haproxy health checks.
- Replace syslogd with one that supports filtering
- Data compression reduces repeated information enormously, when
logfiles are rotated. It's reduced by 16x for my non-HaProxy
server, and it should be reduced more in your case.
See "man newsyslog.conf" for data compression options.