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Prevent servers from receiving messages from blank senders using Domino features

Is there a way to prevent the Domino servers from receiving Internet messages from blank senders? I need this to reduce the amount of spam in my SMTP traffic.

I know there are some third-party products that do this job. I'd like to do it just by using Domino features.
I'd hate to modify the mail template or the mail.box template for this in R5. In Domino 6 you could create a server rule to check the sender to make sure it has some value. Also, you could turn on reverse DNS lookups to verify the sender has at least a registered domain. This can be problematic, though, as not all valid domains and senders will have a corresponding PTR record in DNS.

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