Nothing. OK, I’d classify these as nearly useless. Who decided that
W3SVC extended log file format was a good format for SMTP
logs? They should be forced to troubleshoot mail delivery issues using
their crappy logs in whatever level of hell is reserved for M$.
thought Exim was bad until I got used to the terseness and found out
about the logging options. Postfix’s logs format is very nice and a
human can read it. Exchange is one step up from guessing or having no
logging at all.