spf-discuss
[Top] [All Lists]

include recursion and loop detection

2003-10-24 10:51:35
On Fri, Oct 24, 2003 at 10:47:01AM -0700, Justin Mason wrote:
| 
| Finally, another minor nit: 3.5.1 notes:
| 
|   The <directive-set> could even include another LocalPart lookup.  As
|   with <Include> mechanisms, SPF clients are REQUIRED to support
|   recursion to a depth of 6 lookups.
| 
| but 3.6.* -- the "include" section --  never mentions a 6-lookup limit for
| "include".

thanks, fixed.  do people think a depth-6 lookup is acceptable?  should
we do more?  less?

if a domain is expected to one include for example.com to point to
example.org, a max of 6 lets us cross maybe three administrative boundaries.

| 
| Also, IMO, it might be helpful to specify what to do in case of "include
| loops", ie. 
| 
| example.com IN TXT  "v=spf1 include:example.org default=unknown"
| example.org IN TXT  "v=spf1 include:example.com default=unknown"
| 
| Is the idea to just try it anyway until it hits 6 lookups, or should an
| SPF client "know" that it's already included 'example.com' and ignore 
| that?
| 

clients are expected to perform loop detection.


-------
Sender Permitted From: http://spf.pobox.com/
Archives at http://archives.listbox.com/spf-discuss/current/
Latest draft at http://spf.pobox.com/draft-mengwong-spf-02.txt
To unsubscribe, change your address, or temporarily deactivate your 
subscription, 
please go to 
http://v2.listbox.com/member/?listname(_at_)©#«Mo\¯HÝÜîU;±¤Ö¤Íµø?¡