[Pymilter] pyspf SPF checking raises TypeError exception when checking erroneous record

[Stuart D Gathman]

On Mar 25, Stuart D Gathman transmitted in part:

> On Mar 18, Kazuhiro Ogura transmitted in part:
>
>> Can you try it with a zonedata like this?
>> 
>> zonedata:
>>  e3.example.com:
>>  - SPF: v=spf1 a:mx1.example.com mx:mx1.example.com -all
>>  mx1.example.com:
>>  - CNAME: .
>
> That does indeed break it with real DNS, but not as a test case.
> The reason is that the mock DNSLookup doesn't include supplementary
> data in addition to answers like a real DNS server does.  This
> supplementary data gets added to a short lived (only for one mail
> connection) cache, and having the empty CNAME in the cache is what
> breaks it.
>
> I am working on improving the mock DNSLookup.

Nothing wrong with mock DNSLookup.  The problem was the test zonedata
should be:

zonedata:
  e3.example.com:
  - SPF: v=spf1 a:mx1.example.com mx:mx1.example.com -all
  mx1.example.com:
  - CNAME: ''

Test case (and fix) committed.   Thanks Kazuhiro !