> On May 22, 2019, at 1:50 PM, MRob <mro...@insiberia.net> wrote:
> 
> Thank you for pointing it out. Why is default for the setting same as 
> header_checks? I don't understand the common need for smtp server to run the 
> same header checks on attachment headers, can someone explain?

This is backwards-compatibility.  I agree that in most cases you'll
want nested_header_checks to either be empty, or written specifically
to handle some appropriate requirement, separate from the primary
header checks.

-- 
        Viktor.

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