I have both DoLocalSenderDomain and DoLocalSenderAddress turned on 
already. ASSP sees both incoming and traffic.

I have LocalAddresses_Flat pointing to a regularly updated flat file 
containing every valid email address on the server. localDomains 
points to a similar file containing every valid domain on the server.


At 07:11 AM 1/14/2010, GrayHat wrote:

> > However, anyone who DOES have a valid account, and logs in via SMTP
> > AUTH, can send mail "from" any email/domain, "to" any email/domain.
>
>not exactly; assuming your ASSP sees both incoming and outgoing
>traffic, you may switch on the "DoLocalSenderDomain" and/or the
>"DoLocalSenderAddress" (along with the LDAP or VRFY options)
>this way a sender will need to use a valid *LOCAL* domain (or email
>  address) otherwise the email will be refused
>
>
>
>
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