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Re: [ietf-smtp] SPF DNS query limits

2016-05-24 12:04:44

On 05/23/2016 08:37 AM, Scott Kitterman wrote:
On Monday, May 23, 2016 03:52:39 PM Paul Smith wrote:
2) Is this limit generally being stuck to by SPF evaluation functions?
This limit goes back to the experimental RFC 4408, so it's a decade old.  All
of the open source implementations of which I'm aware follow it (although some
provide configuration options to ignore it).  I don't know the status of any
proprietary implementations.

The four proprietary implementations with which I'm familiar all implement the 10-level limit. Two of those also explicitly checked for loops. It's in the receiver's own self interest to do so.


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