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Why do I see the error "500 Syntax Error, Command unrecognized: XXXX"
Why do I see the error "500 Syntax Error, Command unrecognized: XXXX"
Solution
On Cisco firewalls, the command "fixup protocol smtp 25" in your configuration will essentially disallow EHLO commands. By removing this command, you will allow the Enhanced SMTP protocols (EHLO commands).
Article Details
Article ID:
289
Created On:
16 Jun 2006 02:59 PM
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