Filtering tab
Here's the screenshot-guide for understanding "Filtering tab" function / option.
Maximum # of Emails to Process
Enter a number in this field to set the maximum number of emails able to be imported at once.
Maximum Age of E-mails to process
You can tell bpImportEmail.exe to only import emails up to a certain age (in seconds, by default).
From Filter (Regular Expression)
You can use regular expressions to filter which emails will be imported by the sender of the email.
Subject Filter
You can use regular expressions to filter which emails will be imported by their subjects.
Body Filter
You can use regular expressions to filter which emails will be imported by the content of their bodies.
Minimum Delay between each Import
You can set a delay between each email imported to reduce server traffic.