multiple file attachments to an email

Hi,
I would like to know how SMTP (or any email application like
Outlook) provides information about clearly distinguishing between
different files which are attcahed and emailed at once.

I am monitoring the incoming packets and doing deep-packet processing
by reading the headers upto application layer. Suppose I attach 10
files (word, pdf, xls, txt etc)to an email, I would like to know when
the first file is completely received, when the second file is
completely received and so on. What kind of control messages or fields
in the protocol should I be watching to know the end of a **SINGLE**
file transfer?

NOTE: I am just watching the traffic. I am neither the client nor the
server. I would be watching **ALL** the traffic (control and data)
between the client and server.

I think SMTP really doesn't care about the files being attached. It
takes all of them in binary format and sees them as a payload. But,
there must be a way to clearly distinguish the end of each files being
attached. I think such facility is provided by the individual
email-clients.

Any help is appreciated.

Thanks,
Sri.

Re: multiple file attachments to an email

"Sri" wrote in message
news:1123046555.013283.265000@o13g2000cwo.googlegroups.com

> I would like to know how SMTP (or any email application like
> Outlook) provides information about clearly distinguishing between
> different files which are attcahed and emailed at once.

Your question has already been answered in another group to which you
multi-posted it.