[Dovecot] Maildir filename extensions S=<size> and W=<vsize>

[mailing at securitylabs.it]

On 25/10/2010 10:00, Ralf Hildebrandt wrote:
> I'd like to add S=<size>  and W=<vsize>  to the filenames in my Maildir
> storage for newly delivered mails. But I cannot find where I can make
> Dovecot's LDA add those. Anybody?
>
> http://wiki2.dovecot.org/MailboxFormat/Maildir says:
>
> A maildir filename with those fields would look something like: 1035478339.27041_118.foo.org,S=1000,W=1030:2,S
> which is exactly what I want, but it doesn't tell me how!
>
Hello, I think it's by default. My delivery command in exim is:

command = /usr/local/libexec/dovecot/deliver -d $local_part@$domain -f 
$sender_address -a $original_local_part@$original_domain

and size and vsize are present.