A few images will say more then many words... So here are the screens

(Click to enlarge)

Main Window of Mail Inspector (showing an empty list of emails)

Defining complex filter criterias using the Filter Builder

Some general options

Properties of a configured email client (unlimited numer of Mail Clients are possible)

Define when a notification should occur ...

... and what it should do.

Some security settings to prevent co-works reading your mail while you are not in front of your PC

One of the major improvments of Mail Inspector 4 is its anti-spam capabillities

Reading a simple email message

Writing quick-mails using Mail Inspector is easy