Uh, no. I have seen spammers use dynamic DNS to use throw away dial-ups accounts for incoming main service.
Right, but to run a "real mail server" you need a static address. Which can be registered as a valid mail server. Dynamic IP's cannot.
How about moving this to an approriate forum where people really know spam and mail? Nanog is for moving packets. Nanog does not usually care what is in the packet unless it is a routing protocol.
"The NANOG mailing list is established to provide a forum for the exchange of technical information and the discussion of specific implementation issues that require cooperation among network service providers. In order to continue to provide a useful forum for discussion of relevant technical issues, the list is governed by the following guidelines: " ... Doesn't mention anything about "Nanog is for moving packets". An anti-spam/security discussion seems perfectly acceptable to me. -- Robert Blayzor, BOFH INOC, LLC rblayzor@inoc.net Exclusive: We're the only ones who have the documentation.