Dave Lewis wrote:
>> I think the 10 wrongly issued fail are the most urgent fix. I will
>> look into them as soon as I have time.
>>   
> I agree with this but it is the nxdomain error that I am regularly 
> seeing.  It currently makes it impossible for me to activate SPF on my 
> mail server.

That depends on how you configure the "error" state in the BOFHSPF* 
settings. That result is returned in some situations that should not 
be handled as temporary errors (e.g. toolonglabel, the very first test 
in the suite.) Unfortunately, that way one also accepts cases, such as 
DNS lookup failures, which could be deferred by a 417 response.

Accepting "error" along with "unknown", "softail", etcetera, is a 
possible workaround. I don't think it significantly affects the 
intended meaning of SPF filtering.

> A couple of domains that currently cause the mx (nxdomain) error.
> 
> ebay.com
> cogeco.ca

I'd suggest setting

opt BOFHSPFHELO=all
opt BOFHSPFMAILFROM=pass,none,neutral,softfail,unknown,error
opt BOFHSPFFROM=all

That is to say, if the domain admins are smart enough to deliver a 
loud and clear "fail", and only in such case, foreign postmasters can 
safely reject incoming messages on their behalf. To set up their DNS 
servers so that no lookup failure occurs can be considered part of the 
game.

HTH


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