Telnetting to port 25 on the firewall from an allowed host, and manually passing email commands to the console ended with a 451 "Temporary local problem" error.
I looked into the Mail Manager and there were many emails stuck in Quarantine, including all the test emails sent from inside and outside the firewall. They are all listed as:
"Unscannable encrypted archive" and stuck in quarantine.
I've got no idea where this came from or how to resolve it without disabling things that were working until yesterday.
I've restarted the firewall, the only thing that lets the mail get through is to disable "Quarantine unscannable and encrypted content"
But I think the virus engine is broken. I think this is so because of the following error when trying to install the latest two up2date updates Version 9.105-9 and 9.106-17
id="371O" severity="error" sys="system" sub="up2date" name="Fatal: Up2Date package installation failed: An error occured during the RPM pre-installation test (1)" status="failed" action="install" code="1" package="savi"
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