[exim] ACL Question

Would it be better to do HELO checks in acl_smtp_helo, sender checks in
acl_smtp_mail, setting a variable in each check indicating pass/fail for
rejection later in the acl_smtp_rcpt check per-recipient (thus only doing
the check once), or with various caching, is it just as well to put all
HELO/MAIL checks in the rcpt acl?