Re: "Last Call" pending exp= (empty) erratum

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Frank Ellermann wrote:
> Julian Mehnle wrote:
> > %{h} can never yield an empty <target-name>.
>
> If there's no HELO / EHLO at all, or just the verb without a name, then
> %{h} would be empty / undefined.  That's an SMTP syntax error, but
> receivers could nevertheless decide to talk to the client.
>
> Likely there are more plausible examples how <target-name> could
> end up "empty" or otherwise unusable.
> [...]

OK, but then it's not our problem how implementations deal with it.  
Unspecified input -> unspecified output.

> > RFC 4408 implies a result of "Fail" for the above example of yours,
> > and this is what Mail::SPF does.
>
> Okay, toss a coin between option 2 and 3 for this erratum ?  Or we
> could use Ned's trick, your proposal (option 2) is shorter, and if in
> doubt shorter wins.  (Disclaimer, Ned uses that for spelling issues ;-)

I vote for option 2.

Note however that the change inherent to option 2 only covers the "v=spf1 
exp=" class of cases, not the "v=spf1 exp=%{macro-expression}" (with the 
macro expression evaluating to the empty string) class of cases.  The 
latter is not a syntax error, but is to be considered a DNS processing 
error, which is already covered by RFC 4408 as is.

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