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Statistical information in syslog
* Statistics par transaction
(v+w+x+y/z) v: number of recipients with success
w: deferred recipients
x: number of failure on DNS lookup (host unknown)
y: number of failure on SMTP (user unknown)
z: number of total recipients
relay= destination MX host (IP address if known)
to= recipients to be sent to the MX host
proto= ESMTP features supported by the MX host
delay= time taken for delivery to the MX host
code= final response code from the MX host (accept message)
* Summary statistics
ENVID Envelope identifier passed as ENVID= parameter in ESMTP.
(This may not be same as queue-id by sendmail.)
nquery= number of DNS answers / number os DNS queries
nconnect= connections with success (processed successfully to QUIT
command) / number of connect() to be tried
ntimeout= number of connections which required timeout operation.
ntrans= transactions with success / prepared transactions
counted up multiple times even if same connection is used.
nsent= recipients with success / number of all recipients
ndeferred= recipients with temporary failure
nerror= addressing error on DNS lookup (e.g. host unknown)
+ addressing error on SMTP (e.g. user unknown)
dnsmaxcq= max number of concurrent DNS query
maxsock= max socket number to be used.
tmx= time taken for MX lookup
tdelivery= time taken for 90% delivery with SMTP / time taken for
complete delivery with SMTP (after completion of MX lookup)
maxdelay= time for longest SMTP transact
tdelay= total time by smtpfeed processing
tsendmail= time from start of sendmail till start of smtpfeed
dns_i/o= total number of transfered bytes between DNS server
smtp_i/o= total number of transfered bytes on input/output channel
of SMTP
mem= total size of memory allocated by malloc()