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Re: [ietf-822] Question regarding RFC 2369

2018-07-21 15:20:08
In article 
 you write:
To the extent the first clause applies to software generating messages
that might contain list header fields, usually for the purpose of
first sending them, this makes it harder for software to encode
message header fields in a generic manner rather than having to deal
with special cases like the list header fields, since, among other
things, such software may seek to comply with line length limitations
in RFC 5322 by folding long lines in accordance with that RFC.

Remember that MUST means "do this if you want to interoperate", not "do this or 

Plan A: update RFC 2369 to say MAY add spaces, send out a press release, wait 
everyone in the world to update their software to remove spaces when parsing 

Plan B: figure out how to make your URLs short enough that your List-Unsubscribe
headers are under 998 characters.

I know what I'd do.


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