On 3/16/2024 1:31 PM, Slavko via mailop wrote:
And the same RCF clearly suggests to leave other (even invalid)
signatures untouched.


Which text in RFC 6376 says that?

Perhaps you are thinking of Section 6.1 which includes:

INFORMATIVE NOTE: The rationale of this requirement is to permit
       messages that have invalid signatures but also a valid signature
       to work.  For example, a mailing list exploder might opt to leave
       the original submitter signature in place even though the exploder
       knows that it is modifying the message in some way that will break
       that signature, and the exploder inserts its own signature.  In
       this case, the message should succeed even in the presence of the
       known-broken signature.

which notes it might be done, but certainly is not advice to do it.  (Also note the paragraph is informative rather than normative.  Also note the reference to mailing lists, as being discussed here.

d/

--
Dave Crocker
Brandenburg InternetWorking
bbiw.net
mast:@dcrocker@mastodon.social
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