Hi François,
[...] identify a message from this mailing list quickly by reading it's subject. Could you please add a subject prefix like [WINE-DEVEL] [...]
I solve this by filtering messages To: wine-devel@winehq.org or CC: wine-devel@winehq.org into a separate folder. I see you're using SquirrelMail - does this help: http://its.uwrf.edu/support/squirrelmail/filter.php ?