scott at kitterman
Aug 11, 2011, 9:08 PM
Post #13 of 20
(2125 views)
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On Thursday, August 11, 2011 09:36:45 PM Frank Ellermann wrote:
> Murray S. Kucherawy wrote:
> > in a roundabout way they’re case-insensitive because ABNF (RFC5234) says
> > so when case-sensitivity isn’t expressly stated.
>
> I use your mail as found in the list archive to test that I can in
> fact send mail
> to the list, threading will likely fail. Yes, ABNF is case-insensitive
> unless folks go to the trouble and specify cases-sensitive strings in hex.
> notation.
>
> > Would it break any known implementations to change them to all-lowercase
> > in the new RFC, just to be consistent with other things?
>
> It can't, because ABNF is case-insensitive ;-) There should be test
> cases in the
> test suite covering this point, in other words, it's mostly a question
> of what is
> better readable in 4408bis. In the prose I'd prefer the mixed case
> "as is", but
> wouldn't waste time with arguing if you think that this is confusing.
> In the ABNF
> I don't care, lower case instead of camel case is fine.
>
> That part of the ABNF apparently only affects the Received-SPF header
> field. Is
> there any chance to get rid of this in 4408bis, e.g., with a pointer
> to RFC 4408,
> plus some "please use RFC 5451" blurb? Any "erratum" for Received-SPF
> should be listed, I vaguely recall that this is the case, but this could
> be buried in some "things you really do not more need to care about"
> appendix.
I wrote a reply to this once already, but my phone appears to have eaten it.
My intent is to mark Received-SPF deprecated in 4408bis and SHOULD
authentication-results to give implementors a clear signal what they should be
doing. Removal is inconsistent with the backwards compatibility goal for the
effort. In general deprecated for one update cycle before removal is a good
practice and I think we should follow it.
In IETF terms it would be odd to argue for removal of a widely deployed
feature, AIUI.
Scott K
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