Hi,
There's a third solution. You filter it yourself. I decided to try this
out and you know what? Filtering email with subjects containing the
letter '?' resulted in every email with a Tamil subject in the last 3
weeks (I don't have mail from this list before this date stored on my
computer) being filtered and not one email with a non-Tamil subject
being filtered.
If you have trouble implementing this solution in your email client, I
and others here will be happy to provide you with assistance.