According to Alan J. Flavell, > On Sun, 27 Nov 2005, Tony Godshall (replying to me): > > > > I'd recommend blocking patterns of dynamic/generic IP addresses at > > > RCPT time, such as this adsl-63-195-120-242.dsl.snfc21.pacbell.net > > > (wildcards or regexes can be useful, also there are dnsRBLs that you > > > can use). Then you won't need to get as far as verifying their > > > envelope sender domain. > > > > Oh, that one *is* a problem. I have a static ip myself, but > > it's dhcp-configured by my cable company, quite likely in > > the middle of a dynamic block. People who follow advice > > like like yours are blocking legit people like me. Like > > freakin Verizon does. > > Well, I'm sorry, but your categorisation of "legit" is unfortunate: > the truth is that you're going to find increasing numbers of potential > recipients who will refuse mail on that basis, no matter how "legit" > you consider yourself to be. ...
> For a free-er exchange of mail, you should be using a reliable > smarthost (assuming that you are unable to get your own IP address > "properly" registered to the satisfaction of the mail admin > community). That's just the way that things are - irrespective of > what I might think or say personally about the matter. ... Well, it is in DNS and it does have SPF records. I guess I'll go dig up the specifics to your vague recommendation if it becomes a problem beyond just the one ISP. Thanks for the pointer, though. It's just a form of social darwinism, I guess. I know of at least two Verizon customers who have moved their e-mail off the Verizon servers because of overly agressive blocking. It's a good thing for Verizon for now (reduces their mail load by a tiny tiny fraction) but it also means these people now have more mobility- they can change ISP without having to change e-mail addresses again. ISPs who block to agressively will lose customers and those who accept too much will also lose customers. It's a tricky balance, I'm sure. T -- ## List details at http://www.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://www.exim.org/eximwiki/
