In article
<CAKFo7wk+jLGqjs6mU=Gv3G1xAg+O5OyTmt66fjW4DLzUT5kuPw(_at_)mail(_dot_)gmail(_dot_)com>
you write:
I think a header value limit for important headers stored in overview
systems (From:, To:, Newsgroups:, Bcc:, etc...) could be a good
idea...
There's no formal limit other than the line length, but there is a registry of
header names, shared among mail, netnews and uucp:
https://www.iana.org/assignments/message-headers/message-headers.xhtml
Adding new names to the registry requires expert review and I expect
the expert would be sceptical of proposed names that were a lot longer
than the existing ones. I don't see any over 35 characters which seems
reasonable.
R's,
John
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