does not designate permitted sender hosts

I recently  Installed Exchange Server 2007 and some time I receive email from known address but this message go to Quarantined folder , when I checked this message in Quarantined folder I found this message
"Received-SPF: None (saco-edg-srv.saco-ho.com: Behnoush@saitou-kaikei.com
 does not designate permitted sender hosts).
can any body help me
raedayyoubAsked:
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SteveH_UKConnect With a Mentor Commented:
See http://technet.microsoft.com/en-gb/library/aa996295.aspx for an introduction to Exchange's handling of Sender Policy Framework (SPF).

SPF allows a DNS domain to include a record which indicates which servers are authorised to send e-mail from that domain.  In your case, Exchange is telling you that the SPF record does not exist in DNS, which is pretty common.

Depending on how you've configured Sender-ID filtering, this may quarantine the message or do nothing.  It is likely that there are other causes for the message being quarantined.
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