[exim] maildir_tag - appending size suitable for Dovecot

Hello,

I'm wanting to append the size to the Maildir name in my transport.

eg:
maildir_tag = ,W=$message_size

However, Dovecot wants the 'virtual' size and exim creates the 'actual'
size - and so Dovecot sends truncated email to pop3 clients!
http://wiki.dovecot.org/POP3Server

Is there a way around this? I've seen references to use_crlf, but am
umsure if this is what I want...

Any help appreciated, thanks.



--
Andrew Hearn.