> | is there an efficient hack to double map the inbound ip to see if it is
> | google or yahoo?
> 
> Others have sugested the spf plan.  But if you simply want to check the 
> DNS hostname, then add something like this to the ACL statement:
> 
>   !hosts = *.google.com : *.yahoo.com

by double map i meant the in-addr and then a forward check.

randy

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