First, there are format string limits all over Postfix. As a matter
of principle I would not make a special case for headers.
Second, the existing 200 byte limit should be plenty sufficient to
uniqiely identify every past, present, and future email message in
this universe and in several other ones.
For example, 200 bytes is more than 3x the length of SHA256 in
hexadecimal notation. SHA256 alone is sufficient to uniquely identify
every particle in the universe(*) with a negligible collision rate.
If you can't do unique identification(**) in 200 bytes, then that
is the problem, not Postfix.
Wietse
(*) https://en.wikipedia.org/wiki/Eddington_number
(**) https://en.wikipedia.org/wiki/Universally_unique_identifier
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