How do I reject or delete "Soft fail" emails?

Getting spam messages which are spoofing our own internal email domain.  Exchange is aware of this and marks the message as a Soft Fail.  But how do I stop the message from being delivered into the mailbox?
As I understand Sender ID filtering will only block messages which fail, and this doesn't include Soft Fail.
Thanks

 
Hi Mike,
Please refer to following article:
http://msexchangeteam.com/archive/2005/10/13/412487.aspx
From the article, the Soft Fail (~) means Client might not be authorized to send mail on behalf of the domain from a matching IP address. The Sender ID actions in Exchange 2003 SP2 is to Stamp and Continue. Therefore, the message will not be rejected or deleted based on you configuration.
I would like to explain that the Soft Fail/Fail/NEUTRAL which described in previous article is generated based on the SPF record which you registered on the DNS Server.
If you generated SPF record by using following site, you will receive follow options:
http://www.microsoft.com/mscorp/safety/content/technologies/senderid/wizard/
Option 1(+): Yes; mail may legitimately originate from IP addresses not identified above.
Option 2(?): Neutral; this domain makes no statement about whether mail may legitimately originate from IP addresses not identified above.
Option 3(-): No; this domain sends mail only from the IP addresses identified above.
Option 4(~): Discouraged; mail may legitimately originate from IP addresses not identified above, however, use of such IP addresses is discouraged and may not be permitted in the future.
If you select the Option 4 when generating SPF record, the Soft Fail (~) will be generated even if the message is received from an IP Address which is listed in SPF record.
Therefore, in order to solve the issue, I suggest you update your SPF record on public DNS server by selecting Option No; this domain sends mail only from the IP addresses identified above.
For more information regarding Sender ID Filter:
http://technet.microsoft.com/en-us/library/aa995992(EXCHG.65).aspx
Mike

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