Re: design specifics --- the config label

Raymond S Brand <[email protected]> wrote:
> The same objections that I have to TXT records, in general, for these
> proposals:
...
> * Complicated syntax's that the MTAs need to be taught how to parse.

  I would say that one of the requirements for this work is that the
solution be almost trivial to implement in existing MTA's.  This
probably means a simple syntax.

> sources._email_.${DOMAIN}.		IN	PTR	${PROVIDER1}
> 					IN	PTR	${PROVIDER2}
> 
> Each outbound provider lists the IPs that are authorized to send mail
> (for one or more domains) using the same DNS method that DRIP uses;
> only in the ``senders._email_'' space instead of the ``relays._email_''
> space used by DRIP.

  Then the MTA has to walk all of the PTR records, to find out which
of many providers is the one associated with the current SMTP
session.  Not good...

  Alan DeKok.