Re: namedroppers, continued

["Stephen Sprunk" <ssprunk at cisco.com>]

Paul Vixie wrote:
>> - many ISPs won't let you forward or submit mail through someone
>>   else's SMTP server, even if you have permission to do so.  so you
>>   can't forward your mail through your "home" ISP's mail server to
>>   allow the "mail from" check to work.
>
> in that case you'd be wise to not insert a MAIL-FROM MX for your
> domain.

The vast majority of users do not have the ability to make that decision.

The curious thing is that it is in an ISP's best interests _not_ to
implement this draft, since doing so will likely mark nomadic users' email
as suspect and potentially lose a customer.  Most companies only support the
"public good" to the extent it doesn't cost them any revenue.

S