[nylug-talk] Mail servers on dynamic IP addresses soon to be shunned nearly everywhere.

[Ron Guerin]

Ruben Safir wrote:
>> Nevertheless, whether MAAWG is a synonym for a bunch of companies that
>> need to go out of business or not, if they follow through, the end of
>> the "residential class service" mail server is at hand.
>>
> 
> Even static IP addresses are dropped into spam filters from many of those 
> companies, especially yahoo.

The blame there generally belongs to the ISP in whose name the
registration for that IP address is.   There are other systems in use
that try to divine whether an address is dynamic or not[1], but these
days the ISPs voluntarily publish lists of IPs that mail should not be
coming from.  The problem is, as in the ISP business in general, is one
of quality.

- Ron

[1] I know of at least one that does regexes on the reverse IP under the
theory that a responsible party running a mail server would have changed
their reverse lookup to something that no longer has things like "dun",
"dialup", or "dyn" and their ISP's domain name on it.