Case-sensitive status

Hello all, first-time writer, long-time knower-of-SPF.

I'm aware that Scott has started the work of putting together a push to move SPF from an Experimental to Standards Track document within the IETF.  I'll be helping out where I can.

One change I'd like to suggest has to do with the SPF results strings.  RFC4408 presents these status strings in a specific case.  RFC5451 presents them in all-lowercase.  Neither one explicitly says anything about whether or not consumers of the results need to test them in a case-sensitive manner, although in a roundabout way they're case-insensitive because ABNF (RFC5234) says so when case-sensitivity isn't expressly stated.

Would it break any known implementations to change them to all-lowercase in the new RFC, just to be consistent with other things?

-MSK



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