it should work.  make sure you wrap the email address in quotes:
filename mailbox email
		TO=('usergroup@yourdomain.com')
		FROM=('NoReply <NOREPLY@yourdomain.com>')
		SENDER = ('NoReply <NOREPLY@yourdomain.com>')
		IMPORTANCE='HIGH'
		replyto='NOREPLY@yourdomain.com'
         Subject='Greetings, this is an email';
  
DATA _NULL_;
FILE Mailbox;
PUT "Greetings Someone,";
PUT "  This is a message from a SAS.";
RUN;