How do i send mail to certain domain users over external smtp using sendmail?

[Nash Nipples]

           hi, i just dont see any options to make it work

 "| /usr/sbin/sendmail -Ac -t" works fine
 but "| /usr/sbin/sendmail -O ConnectOnlyTo=smtp.external.co... -Ac -t" just wont work:
 WARNING: RunAsUser for MSP ignored, check group ids (egid=10103, want=25)
 can not chdir(/var/spool/clientmqueue/... Permission denied
 Program mode requires special privileges, e.g., root or TrustedUser.
 554 5.3.5 Local configuration error
 
 I dont want to set up trusted users. Any work-around available?
 
 thanks
		
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