dovecot - Feb 2013 - Keyword Flags

I mostly use Mutt to read mail but today I fired up Thunderbird.

I have a shell script that looks for new mail, which looks for files
in cur/ and new/ ending with the server hostname or a comma.

When I fired up TB it seems that all new mail has been given a flag of
,a which I gather means it matches a keyword.

My questions are:

How did this happen?
Did TB do something strange to my mail when it fetched headers?
If I change my search parameters to ',[a-z]' will this only catch new
mail?

Cheers

-- 
When all you have is a Swiss Army Knife, every problem looks like email.
    -- Peter da Silva

On Mon, 2013-02-11 at 04:14 +0000, David Woodfall wrote:
> I mostly use Mutt to read mail but today I fired up Thunderbird.
> 
> I have a shell script that looks for new mail, which looks for files
> in cur/ and new/ ending with the server hostname or a comma.
> 
> When I fired up TB it seems that all new mail has been given a flag of
> ,a which I gather means it matches a keyword.
Yes, see the 0 number in dovecot-keywords
> My questions are:
> 
> How did this happen?
> Did TB do something strange to my mail when it fetched headers?
> If I change my search parameters to ',[a-z]' will this only catch
new
> mail?
I guess it marks it as $nonspam.