Is there a way to filter out anonymous emails?
Assuming that you are using Domino R5 as the SMTP server, go to the Domino public address book, then to the Server / Configurations view. Open the configuration document for this server, then select the tabs Router & SMTP / Restrictions and Controls / SMTP Inbound Controls.
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The settings "verify connecting hostname in DNS" and "verify sender's domain in DNS" should do the trick. When you turn these on, Domino will only accept inbound mail from a computer with a known domain name and a sender with a known domain name.
Dig Deeper on Domino Resources - Part 5
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