It appears that Bill Cole via mailop <mailop-20160...@billmail.scconsult.com> 
said:
>Who uses it?

In my logs most of the l= tags are l=1 on that libertarian newsletter,
and one or two other newsletters.

I see that Verisign puts an l= in the mail their employees send with the
real message length.

Other than that, I'm with you, it is a fraction of a percent of signed
mail, not common at all.

R's,
John
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