Listen (-LSN)

Use the listen (-LSN) command to specify a time (in seconds) to wait for messages to arrive. If no email is available in the specified listen time, you will receive an error message of Source not available.

The command -LSN 0 means do not wait at all. If no message is immediately available, the adapter returns a warning indicating that no messages were found.

-LSN seconds
The number of seconds to wait for messages to arrive