DSN feature in sendmail 8.9

[Aris Mulyono]

All,

I tried to set dsn_notify and dsn_return variable in mutt
but when I sent the email the sendmail complained about the option
-N not being recognized.
What FEATURE should I enable specifically in sendmail to do this?

TIA,
-Aris
-- 
I did this 'cause Linux gives me a woody.  It doesn't generate revenue.
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