[exim] delay_warning_condition respecting Auto-Submitted hea…

The default delay_warning_condition is:

${if match{$h_precedence:}{(?i)bulk|list|junk}{no}{yes}}

which is sensible as it prevents warning messages getting created for
many kinds of list and other automated mails.

However, noting some unwanted delay warnings going to administrative
mailboxes that appear as envelope senders in automated e-mails related
to various routine tasks, I wonder whether it should be extended to
refer to the Auto-Submitted header too? (see RFC3834 for more info)

I'm trialling this at the moment:

${if or { \
          { {match{$h_precedence:}{(?i)bulk|list|junk} } \
          { {match{$h_auto-submitted}{(?i)auto-generated|auto-replied} }\
         } \
         {no} \
         {yes} \
  }

Any thoughts?

Tim