Joseph Conrad:
> Outlook Express error:
> 
> An unknown error has occurred. Account: 'pop.rockymountains.net', Server:
> 'smtp.rockymountains.net', Protocol: SMTP, Server Response: '421 ', Port:
> 587, Secure(SSL): No, Server Error: 421, Error Number: 0x800CCC67

You mentioned that AVAST is playing man-in-the-middle between the
mail application and the mail server. 

Like this: Outlook Express <=> AVAST <=> POSTFIX.

Your logging shows that AVAST hangs up after POSTFIX replies to
EHLO (or was it HELO), so this is evidence that POSTIX did not send
421. It would be a safe bet that AVAST was doing that instead.

        Wietse

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