On Fri, 2002-03-01 at 13:13, Greg Owen wrote: > > Here's the crazy thing: the response is "500 Unsupported command." - that > response is NOWHERE in Courier. And the problem occurs if you use 'telnet' > to connect by hand, as follows:
What firewalls/proxies/gateways lie between you and the Courier server? It seems like someone recently noticed that some commands were reaching his courier server as XXXXXXX because a gateway was modifying the commands on the wire to "protect" the SMTP server.
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