> > How does an SMTP client recognize an ASA box before it breaks email? 
> 
> Only from the /^[02 *]+$/ banner.
> # telnet mx.interfree.it 25
> 220 ******************************************************************

I think the newer versions of ASA can be configured to let ESMTP pass through
without censoring the greeting, while still exhibiting one of the header
parsing bugs - which can lead to dropping the TCP session without
a RST (but with a message in the log ... which noone reads).

  Mark

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