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protocol smtp 590
https://forum.linode.com/viewtopic.php?f=11&t=1556
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Author:  stec [ Tue Mar 15, 2005 5:32 pm ]
Post subject:  protocol smtp 590

anyone know what is this one?

Author:  schmichael [ Tue Mar 15, 2005 6:40 pm ]
Post subject: 

I take it you mean response code 590? Well it isn't in RFC 821 or 2821, so I have no clue why you're seeing it.

Author:  stec [ Tue Mar 15, 2005 8:10 pm ]
Post subject: 

mail server is inside of a qos box and gateway router outside.
i block smtp on the router but i still see this smtp 590 to my mail server on the qos.

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