- From the "Tools" menu select "Filters..." (or press F4 from the main Poco menu).
- Make sure the appropriate tab s selected (by default it should be the "Incoming" tab).
- Press the "New Filter" button near the bottom left of the form.
- In the "Search" field select the item you want to filter on (eg: "From").
- In the "for" field enter the value you want to search for.
- If you want to perform the actions only when the condition is not met then check the "Match only if not found" box.
- Select the "Perform" action you want.
- If you selected "Move message to" then select the "Unknown sender" mailbox.
- Press "Ok" to save the filter and "Ok" to close the filter window.