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Markus Stumpf wrote: > From the structure of the command I'd guess it is some filter/firewall > that maybe sees an EHLO, considers this a bad command and masks it with > "XXXX". > > Anybody else seeing this or knows what fine piece of ^H^H^H^H^Hsoftware > is doing this? Almost surely a Cisco PIX with "fixup protocol smtp" active.
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