|I have added this to the feature request list, but currently it is not supported.
The only way to run the rules is to send the messages to your mailbox and download them again with the program.
You can simply select all the messages you would like to send, right-click them and select "Move to Folder" option. In the "Select a mail folder" window, double-click the Outbox to move messages to the Outbox folder.
Press the Start button on the main toolbar to send all the messages from the Outbox folder.