>[0.0.0.0] MAIL FROM:<[EMAIL PROTECTED]>
>07:30 05:28 SMTPD(7AA101FA) [0.0.0.0] RCPT TO:<[EMAIL PROTECTED]>

since you aren�t hotmail, this is a relay attempt (assuming SMTP AUTH has 
not succeeded in the same session)

>07:30 05:28 SMTPD(7AA101FA) [0.0.0.0] ERR mail.someplace.com invalid user 
><[EMAIL PROTECTED]

this is Imail refusing to relay.

>(where 0.0.0.0 is some IP).  So I block this IP, but then others show up 
>later in my log doing the same thing.  Is this some sort of attack?

yes, attempted relay hijack

>Why would this show up in my log if I'm using SMTP AUTH?  This is what I 
>suspect is crashing SMTP AUTH but also notice SMTP AUTH fail even when 
>this type of message is not currently in the log.  Any suggestions?

>this isn�t SMPT AUTH failing, afaics.
>
>When SMTP AUTH fails to respond, the sender times out and the SMTP doesn�t 
>terminated normally.
>
>Len

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