Stop Sendmail from bouncing unknown user?

[Brian Lewis]

I would like to configure Sendmail outgoing to not generate a 'bounce
reply' if the target user is 'unknown or invalid'.  Basically if Sendmail
Outgoing is unable to deliver it then it should keep attempting to
deliver, but if its told by the receiving server the user doesn't exist
then I don't want it to reply back to the spammer that it doesn't exist,
instead it should just discard the email.  Anyone know if Sendmail can be
configured in this way?  Sick of seeing the server attempt to delivery
thousands of invalid or unknown user replies usually to invalid FROM
addresses.

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