You just need to take it a step further :-)

...
rcpt to: <[EMAIL PROTECTED]>
250 recipient <[EMAIL PROTECTED]> ok
data
354 go ahead
Testing
.

554 delivery error: dd This user doesn't have a yahoo.com account 
([EMAIL PROTECTED]) [0] - 
mta367.mail.mud.yahoo.com
421 Service not available, closing transmission channel.
Connection closed by foreign host.


[EMAIL PROTECTED] wrote:
> On Wed, 06 Feb 2008 10:44:10 CST, Paul Schmehl said:
> 
>> RCPT TO: <[EMAIL PROTECTED]>
>> 250 recipient <[EMAIL PROTECTED]> ok
> 
> % telnet f.mx.mail.yahoo.com 25
> ...
> rcpt to: <[EMAIL PROTECTED]>
> 250 recipient <[EMAIL PROTECTED]> ok
> 
> Yee. Hah.  They 250 for a probably-nonexistent account (unless that
> one actually *does* exist? :)
> 
> 
> 
> 
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