LINEBUF questions

I'm trying to chase down some very infrequent "Exceeded LINEBUF" errors
and want to make sure I understand this variable correctly.

AFAICT the error is likely to be occurring when extracting the contents
of the To: header to a variable with the MATCH operator. So...

1. Can LINEBUF be adjusted in either direction?  Such as:

LINEBUF=8192
:0
{ Recipe }
LINEBUF=2048

2. If the above is not meaningless, is anything gained or lost?

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