I ve a question about mail proxy on BM3.8 Sp3. All the mails that are
incoming are placed in the etc\spool\incoming folder. My question is, are
the mails placed there while the mail is still incoming. Or are they
placed there only when they are completely received.

I am asking this because the internal mail server behind the mail proxy is
receiving the mails with around 5,6kb/s. And i want to know why this can't
be any faster as 5,6kb/s because it looks that the mails are already
completed in the incoming folder on the mail proxy server.