[ale] Being used in a DOS attack against others

[mhirsch at nubridges.com (Michael Hirsch)]

Someone has been using our mail server to amplify a DOS attack against
some other mail servers.  It works like this.  Then send a mail to
randomuser at nubridges.com with a return address of attackedcompany.com. 
Since random user does not exist we send a reply that the user does not
exit to attackedcompany's mail server.  So we flood their mail server.

I've never seen this attack before, though it seems quite simiple.  Is
this a well know DOS attack?  Has anyone else been experiencing this? 

It seems to have stopped this morning, but it was ongoing for the last
two days.

--Michael


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