this sets how detailed you wish the logging for this module to be
Off, Critical, General, Verbose, Full, Debug
Verbose
Log
This shows the tail (the last few lines) of the SMTP Relay log file. You can use the drop down number selector to select how many of the last lines to view. If you wish to see the entire file, it is recommended that you use a text editor on the log file in the server itself, you will find the log files within the ./logs/ directory under the directory into which you installed the application
SMTP Diagnostic Logging
SMTP Protocol Logging
The SMTP protocol transactions will be logged to the file logs/SMTPOut.log