https://bugs.exim.org/show_bug.cgi?id=1684
--- Comment #4 from Heiko Schlittermann <hs@???> ---
According to the spec, header_line_maxsize imposes a limit on the total length
of all joined lines of a specific header - so it's limit on the logical line
length.
And I'm sure you'll find legitimate logical header lines with >998 characters
in total, folded into individual physical lines.
Auto-folding may be an option (as Viktor writes) and maybe additionally a
configurable limit on the length if an individual physical line.
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