Strange Mail from line

Just curious what the person/program below is trying to do. We get several
of these a day. I know it's spam. Are they trying to read addresses from a
file or something during the converstion? It doesn't cause any issues. I'm
just curious what it is they are trying to do.

-Matthew

Transcript of session follows.
Out: 220 mail.nnacorp.com ESMTP/SMTP NNA Mailserver UCE/UBE not allowed!!!
By
connecting to this server you agree to be relay tested by a third
party.
Have a nice day.
In: HELO ds-7.syndicatesales.biz
Out: 250 mail.nnacorp.com
In: MAIL FROM: <C:\Documents and Settings\Administrator\My
Documents\0-AJC\kw-info\syndicatesales-1.txt>
Out: 501 Bad address syntax
Session aborted, reason: lost connection