What's qmail 2.0 bugtraq is talking about?

[Davi]

Hi guys,

A search about qmail in bugtraq (www.securityfocus.com) returned me a DoS 
about lots of RCPTs. I tried the exploits and qmail stayed alive. 
First of all, is this vulnerability true? 

And more strange. Why was this bugtraq entry updated this month to say that 
qmail 2.0 is also vulnerable? Wtf is this qmail 2.0?

[]s
Davi