chkuser 2.0 - logging format

starting from 2.0.9, logging has been extended and improved.

When #defines for logging are enabled, chkuser patch emits log informations on the same qmail-smtpd log destination

This is the log format:

CHKUSER "brief message": \
from <sender:remoteinfo:chkuser-identify> \
 remote <helo:remotehostname:remotehostip> \
 rcpt <recipient> : "extended message"

where

Item	Meaning/value
brief message	accepted rcpt relaying rcpt rejected relaying rejected rcpt no auth resource mbx overquota rejected intrusion intrusion threshold accepted sender rejected sender must auth
sender	sender declared within "mail from"
remoteinfo	the value of "TCPREMOTEINFO" or the autenticated user
chkuser-identify	the value of CHKUSER_IDENTIFY env variable (this name is defined by #define CHKUSER_IDENTIFY_REMOTE_VARIABLE)
helo	helo declared from remote system
hostname	the value of "TCPREMOTEHOST"
remotehostip	the value of "TCPREMOTEIP"
recipient	recipient address
extended message	this field has more wide description for some generic "brief message":
	accepted rcpt	found existing recipient
	accepted any rcpt	accepted any recipient for any rcpt domain (from 2.0.9)
	accepted any rcpt	accepted any recipient for this domain (from 2.0.9)
	relaying rcpt	client allowed to relay
	rejected relaying	client not allowed to relay
	rejected rcpt	not existing recipient
	rejected rcpt	max number of recipients
	rejected rcpt	max number of invalid recipients
	rejected rcpt	invalid rcpt address format
	rejected rcpt	invalid rcpt MX domain
	rejected rcpt	temporary DNS problem (from 2.0.9)
	intrusion threshold	max number of allowed rcpt
	intrusion threshold	max number of allowed invalid rcpt
	rejected intrusion	rcpt ignored, session over intrusion threshold
	no auth resource	no auth resource available
	must auth	sender not authenticated/authorized (from 2.0.9)
	mbx overquota	rcpt mailbox is overquota
	accepted sender	sender accepted (from 2.0.9)
	accepted sender	accepted any sender always (from 2.0.9)
	accepted sender	accepted null sender always (from 2.0.9)
	accepted doublebounce	accepted qmail doublebounce #@[] (from 2.0.9)
	rejected sender	invalid sender address format
	rejected sender	invalid sender MX domain
	rejected sender	temporary DNS problem (from 2.0.9)