sendmail & rejecting at SMTP time

i'm managing an ensim-based server which uses (groan!) sendmail. it's causing a lot of collateral because it sends out a bounce when mail is sent to an unknown recipient.

is there a way to make sendmail reject unknown recipients at SMTP time (as opposed to accepting, then sending out a bounce later), like Exim's default configuration?

thanks in advance.

 

 

 

 

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