> same here, it appears like someone is doing tests on their end, because these > errors first appeared today and only for a few hours.
Same here, too. Perhaps they have also a "Cisco Firepower" Firewall or similar device: One of our customers had similar problems yesterday with an update and snort-rules which interfered with SMTP and Start-TLS. -- Regards, Bernhard Lichtinger Leibniz-Rechenzentrum Boltzmannstr. 1, D-85748 Garching
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