In the Log's subdirectory there is an slsmtp.log, which is the boot log for the 'slsmtp.exe' service.
This is a simple text-readable file:
2000/01/19 12:34:30.747 - Boot Log Started
2000/01/19 12:34:30.777 - Service Starting
2000/01/19 12:34:30.827 - System using Single Processor heaps.
2000/01/19 12:34:30.827 - The Memory Manager has initialized!
2000/01/19 12:34:30.827 - 1 System Processors, 2 Worker Threads
2000/01/19 12:34:30.827 - System Timers Created
2000/01/19 12:34:30.827 - Registered Events Timer Created
2000/01/19 12:34:30.827 - System Processing Queues Created
2000/01/19 12:34:30.827 - System Completion Ports established
2000/01/19 12:34:30.827 - Secondary Queues Created
2000/01/19 12:34:30.827 - Secondary Completion Ports established
2000/01/19 12:34:30.827 - System Scheduler on-line
2000/01/19 12:34:30.837 - Registered Event Scheduler on-line
2000/01/19 12:34:30.837 - System worker threads created
2000/01/19 12:34:30.847 - System secondary worker threads created
2000/01/19 12:34:30.937 - System Event Logger on-line
Note: It is important to check this file -- particularly this section -- for errors during troubleshooting.
2000/01/19 12:34:30.947 - Loading registered modules
2000/01/19 12:34:30.947 - Cataloging Enabled Module 'ARMModule'. {1a1d2c62-3498-11d3-99dd-004033aa9976}
2000/01/19 12:34:30.967 - Cataloging Enabled Module 'ETRN SMTP Interface'. {5562069f-a984-11d1-aa09-00400542361a}
2000/01/19 12:34:30.977 - Cataloging Enabled Module 'SMTPProxy Receive'. {5aef7bb0-0249-11d3-a20b-00400536e9fc}
2000/01/19 12:34:30.987 - Initializing module {5562069f-a984-11d1-aa09-00400542361a}
2000/01/19 12:34:30.987 - Module Initialized
2000/01/19 12:34:30.987 - Initializing module {5aef7bb0-0249-11d3-a20b-00400536e9fc}
2000/01/19 12:34:31.017 - Module Initialized
2000/01/19 12:34:31.017 - Initializing module {1a1d2c62-3498-11d3-99dd-004033aa9976}
2000/01/19 12:34:31.017 - Module Initialized
2000/01/19 12:34:31.017 - System Scheduler Callback established
2000/01/19 12:34:31.017 - System Registered Events Callback established
2000/01/19 12:34:31.017 - Core services on-line. System Ready.