/etc/postfix/main.cf:
    smtpd_restriction_classes = restrictive, permissive
    restrictive = smtpd_helo_required = yes
    permissive = permit

    smtpd_recipient_restrictions = 
	regexp:/etc/postfix/recipient_access

/etc/postfix/recipient_access:
/^bla\.ru$/              permissive
/^bla1\.ru$/             restrictive      
/^bla2\.ru$/             restrictive