Sendmail - block mail based on recipient address?

[Sean Carolan <scarolan@xxxxxxxxx>]

Maybe someone can help me sort this out.  I want to block outbound
mail from my network based upon the recipient address.  Internal
servers should still be allowed to send emails, but not to a few
specific addresses.  I've tried creating some rules in
/etc/mail/access but to no avail.  Is it possible to do this?
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