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SPF implementations MUST limit the number of mechanisms and modifiers that do DNS lookups to at most 10 per SPF check, including any lookups caused by the use of the "include" mechanism or the "redirect" modifier. If this number is exceeded during a check, a PermError MUST be returned.
Does Smartermail enforce this?
If so does it log a specific error when SPF fails with a PermError due to excessive SPF recursion (as opposed to just logging an SPF failure)?
MTAs or other processors MAY also impose a limit on the maximum amount of elapsed time to evaluate check_host(). Such a limit SHOULD allow at least 20 seconds. If such a limit is exceeded, the result of authorization SHOULD be "TempError".
Does Smartermail impose this limit?
If so, is it configurable?