By default, if you enable the verbose log on SMTP receive or send connectors the files are updated with a certain slowness (5 minutes) and, if you need to troubleshoot, is a little’ uncomfortable not having logs in real time. To decrease the update time you have to make a change to the configuration file
that you find in “C:Program FilesMicrosoftExchange ServerV14Bin”, the two lines to be added inside the tag <appSettings> (It is an xml file) are:
<add key=”SmtpSendLogFlushInterval” value=”0:00:30″ />
<add key=”SmtpRecvLogFlushInterval” value=”0:00:30″ />
Respectively for receiving and sending log. Restart the transport service (Microsoft Exchange Transport) and you are good to go!