As I said, not everyone sending through an ISPs smtp server is an @<put_isp_name_here> email address. 


Yes, and this is one of the problems I have had in the past when my email host didn't provide an SMTP server. However if you are using your own domain for email, you should be using the SMTP server of the email provider, and the email provider should provide this. If they don't provide an SMTP server, then it is time to find another email provider.

ISP mail services are not free - they are part and parcel of what we pay an ISP to provide - if you dont believe me try leaving xtra and maintaining your mail address. They will charge you - they see it as a paid service. 

Actually some ISPs have changed the wording in the advertising, in regard to email. For example telecom now they say it is a 'free'  service if you are a broadband customer.
Just because you don't pay for it, doesn't mean that they have to allow you to continue using email, after you stop using them as an ISP.


further more your argument above implies that non-business users who use an ISP email system should be prone to blacklisting between Nz ISPs. sorry - but I wont buy that. My email to my granny is just as important and timely to me as business mail is to a business. I choose to use an @NZ_ISP_Email address to give my internal to NZ emails a better chance of ariving - if that wasnt the case I would use a .za, or .cz or similarly unliked email domain. But I dont cause I want my emails to my granny to be more trusted and have a better chance of arriving.

personally a .ro address would be great.    he@ro   would des cribe me perfectly <grin>

It has nothing to do with the domain extension as far as I know, so you can use anything you want. It is to do with the IP address of the server that is sending the emails, at least that is the case with RBLs.  Telecoms for example uses Yahoo, which isn't hosted in NZ, but their emails shouldn't be treated any worse than those hosted in NZ, in terms of reputation, just becuase they are hosted overseas.
Also it isn't a matter of 'blacklistings going on between various ISPs', as far as I know.  Blacklists should be independent of any ISP, so if they are using RBLs, they are universal blacklisting systems. eg enter your IP of your email server into the following website, and it will show you if it has been blacklisted . All the ticks should be green, if you have a clean IP.