Milter-greylist

Under RHEL 6.7 I have  a lot of messages like that
in /var/log/messages :

...
Apr 12 11:02:32 emix2 rsyslogd-2177: imuxsock begins to drop messages
from pid 6929 due to rate-limiting
Apr 12 11:02:34 emix2 rsyslogd-2177: imuxsock lost 407 messages from pid
6929 due to rate-limiting
Apr 12 11:16:16 emix2 rsyslogd-2177: imuxsock begins to drop messages
from pid 6929 due to rate-limiting
Apr 12 11:16:17 emix2 rsyslogd-2177: imuxsock lost 66 messages from pid
6929 due to rate-limiting
Apr 12 11:23:54 emix2 rsyslogd-2177: imuxsock begins to drop messages
from pid 6929 due to rate-limiting
Apr 12 11:23:55 emix2 rsyslogd-2177: imuxsock lost 47 messages from pid
6929 due to rate-limiting
...

PID 6929 is milter-greylist one

# ps -ef | grep 6929
smmsp     6929     1  0 Apr07 ?
00:10:56 /usr/local/bin/milter-greylist -v

I do the following changes to /etc/rsyslog.conf and restart service.
 
# default RateLimitInterval=5 et RateLimitBurst=200
$SystemLogRateLimitInterval 2
$SystemLogRateLimitBurst 500

without results ... on imuxsock log messages.

I found no milter-greylist log related to a lot of dropped messages
in /var/log/maillog excepted the few regular ones like :

...
...milter-greylist: u3C9NlWQ031863: skipping greylist because address ...
...milter-greylist: u3C9NnSN031876: skipping greylist because sender is SPF-compliant
...milter-greylist: u3C9O3Is032038: addr  ... delayed for 00:06:25 (ACL 907)
...

I had the same rsyslogd problem with DNS/named and I found at the same
moment in /var/log/bindlog a lot of named log messages before the
message saying dropped messages appering in /var/log/messages.

Why milter-greylist do not log a lot of lines just before  the imuxsock
message ? Is it related to the log level ?

I have the folowing rsyslog line :

mail.info                             -/var/log/maillog

I have no logfac directive in my greylist.conf so default is LOG_MAIL
with different level LOG_WARNING, LOG_INFO, LOG_ERR, LOG_DEBUG.







-- 
Christian P�lissier / 34419
ONERA DRI/RSC
BP72 92322 Chatillon CEDEX