Using filters in Evolution 2.22.1

I have set up Evolution for the first time to collect mail from two accounts. I have also created several new mail folders and filters to sort the mail into the various folders. For some reason that I do not understand none of the filters will work. Here is an example of what I did:

I created a mail folder called "Margaret" and then a filter called Margaret Filter which reads 'sender contains Margaret D <email address hidden> move to folder Margaret". I did similar things in creating other folders with filters along the same lines. When I ran Evolution for the first time everything went into the Inbox and wasn't filtered.

When I created the mail folders I selected "File/New/Mail Folder/ folder name/ on this computer" and got a series of mailboxes that were separate from the inbox. Thinking that this might have been the wrong thing to do I deleted them all and then re-created them inside the inbox but still the filters won't work. I have tried highlighting some of the emails that should go into a particular folder and clicking "Message/Apply Filters" but nothing happens. Is there something somewhere that I have missed?

I have never used Evolution before; I tried to use the Windows version but it gave so many incomprehensible error messages that I uninstalled it and never got to use it. As it seemed quite good on Ubuntu 8.04 I thought I would use it in preference to web mail. I have used Thunderbird on Windows but it had a nasty habit of suddenlt deleting mail both from my hard disc and the server desptie ticking the option to leave mail on the server, so I don't want to risk installing that on Ubuntu in case the same thing happens.

Can anyone suggest why my filters won't work? The seem correct to me.