[exim] ACL ordering question

Just a quick 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?

Thanks in advance!

-Mike