I got the following reply regarding Land Attack which might well be it.
Info is at
http://www.wired.com/news/technology/0,1282,8707,00.html
http://support.microsoft.com/support/kb/ARTICLES/Q165/0/05.asp
>Envelope-to: [EMAIL PROTECTED]
>From: "Rob Tashjian" <[EMAIL PROTECTED]>
>To: "Adam Richardson" <[EMAIL PROTECTED]>
>Subject: Re: Strange hack attempt on port 25 from my own ip address
>Date: Wed, 27 Jun 2001 09:26:31 -0700
>X-Priority: 3
>
>Adam,
>
>Look up 'Land Attack'. You send a packet to a host with the source
>and destination addresses set to that host's address, and the source and
>destination port set to the same port. The host then dies a horrible death
>trying to reply to itself.
>
>rwt
>---
>Robert Tashjian
>[EMAIL PROTECTED]
>
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