Don't send mail directly from a dial-up IP.
Use your ISP to send mail.
He is not using dial-up IP. He has *static* IP. One of the reasons people *pay* for static IP is to be able to have total control of their outgoing mail. Also, some ISPs will not allow you to relay through them if you have static IP. They give you connectivity and IP address. That is what you paid for and that is where their obligations toward you end. This is more common with big pipes such as E* and T* connections, than when you simply pay extra to have static IP on your cable or ADSL.
Anyhow, in my personal experience, using RBL lists for detecting dial-up pools for purpose of blind blocking is very bad idea. Those lists are impossible to be made accurate. It is trivial to find examples of dial-up pools not listed in those lists, and to find static ranges that are incorrectly listed (mostly small companies that own small number of IP addresses, larger companies that own at least entire C class are usually spared). Dial-up pools RBL lists have too much false positives and false negatives to be usefull on their own.
The reason is that ISP can use IP ranges it owns however it wants (which is perfectly OK, nothing wrong with it). ISP has no obligations to inform anybody what IP ranges it uses for dial-up pools, and what ranges it uses for customers who pay extra for static IP (this is perfectly OK too). It can move entire C class from dial-up pool to static customers without informing anybody, and it can do the other way around too. Said that, I am not aware of a single ISP that will publish such information, and some ISPs will not give you that information even if you ask for it.
Said that, the only place where dial-up RBL list is of any use are score based anti-spam tools (such as SpamAssassin). If you assign small score, it will not block emails by itself, but it will make contribution to the big picture. Add AWL to the mix, and dial-up RBL lists become actually usefull. For anything else, *do not* use them. You'll end up blocking legitimate email. Such as emails from the OP.
-- Aleksandar Milivojevic <amilivojevic@xxxxxx> Pollard Banknote Limited Systems Administrator 1499 Buffalo Place Tel: (204) 474-2323 ext 276 Winnipeg, MB R3T 1L7
