[exim] acl_smtp_quit

I'm trying to expire entires out of my greylisting database early if the
server doesn't issue a QUIT command (with quite a few safety checks so I
don't expire a well trusted host).

While acl_smtp_quit works just great at knowing which clients issue a
QUIT command, but I'm not really interested in that, I want to know
which cilents don't issue it. The docs on this ACL are pretty much 1 line :P

I've played around with it a little and it seems (laughably enough),
that acl_smtp_quit is only called on ... a quit!
Is there some way to detect a discon?

Ted.