On 2010-02-09 22:31, dar...@chaosreigns.com wrote: [Ideas for a new scheme similar to a subset of SPF.]
I don't think the SpamAssassin users list is the right place to discuss a new generasl scheme like this, but here goes anyway.
Please not that the comments below is just a first reaction. I haven't really thought this through.
A general thought is: What does your current scheme give that HELO SPF + FCDNS doesn't? (SPF can be used with HELO as well as MAIL FROM).
What format should this arbitrary A record be?
I suggest you use a leading underscore for you magic subdomain (2.0.0.10._mtx.smallbusiness.com).
I do this because I think your scheme need one more thing to be of any use at all. It needs a way for the domain owner to sopecify that they are using it. This could be done by creating a record for "_mtx.smallbusiness.com".
Without a way to indicate wether the scheme is used or not, it'll be unusable for blocking until *all* major email providers as well as almost everyone else is using it.
Using an underscore makes it less likely to collide with existing host names. It also makes it more apparent that it's not a regular hostname.
A new record type might be even better. Regards /Jonas -- Jonas Eckerman Fruktträdet & Förbundet Sveriges Dövblinda http://www.fsdb.org/ http://www.frukt.org/ http://whatever.frukt.org/
