Re: Unknown mechanisms

On Friday, September 02, 2011 01:43:55 PM Murray S. Kucherawy wrote:
> After a brief re-read, I see that RFC4408 explains that unknown modifiers
> are to be ignored, but doesn't say what to do if there's an unknown
> mechanism encountered.  Since such a mechanism fails the ABNF grammar, I
> presume that means a receiver should just ignore the entire record because
> it's invalid.
> 
> Should the updated one say that explicitly, or say "ignore unknown
> mechanisms", or just leave it the way it is?
> 
New mechanisms (unlike new modifiers) can change the SPF result.  If we were to 
add a new mechanism, then we'd have to bump the version.  If an unknown 
mechanism is encountered, the correct result is permerror.

Scott K