[X4U] Mail spam filtering

[Jim Freeman]

There is one spam message that I have been getting several times a day 
for months. It always ends up in my in box and I always mark it as 
junk. But it keeps coming back. What ever happened to Mail learning?

It's an ad for on-line drugs that includes a gif of a little three 
column table listing four drugs and their prices. The to, from and 
subject headings are always different, and presumably the junk text at 
the bottom is always different, but that table is always the same and 
presumably the link it is attached to is always the same. Why doesn't 
Mail filter this out?

Jim