Oh, we were supposed to know the purpose of your question without it
being stated. This is like a female that stomps, "Well, if you don't
know what's wrong then I'm not going to tell you." Yeah, like that
resolves anything. All that could be determined from your original post
is that you wanted to repeatedly send a reply to the same sender. That
could, for example, be a lame attempt to punish a spammer (but then they
don't use their real e-mail address).
You asked about an auto-reply function, not on how to define a rule.
The protection that I mentioned is to prevent endless loops between 2
users that are stuck auto-replying to each other.
An auto-reply *function* is not a rule based on the Subject header. It
doesn't care what is the Subject header's value. It merely retains a
list of prior senders so that an auto-reply e-mail is not again sent
back to the same sender.
If you are using a rule that tests on the Subject and, when triggered,
sends an e-mail back to the sender then that really isn't the auto-reply
function to which Outlook users are accustomed which is implemented in
the Exchange mail server. You can define a rule to test on the Subject
and then reply using a template. Alas, Outlook was designed to reply
just once to emulate the Out Of Office feature in Exchange. You don't
get to specify a reply count (with, for example, zero meaning to reply
every time). See:
http://support.microsoft.com/kb/311107
"The Rules Wizard rule to "reply using a specific template" is designed
to send the reply only one time to each sender during a session. This
prevents Outlook from sending repetitive replies to a sender from whom
you receive multiple messages.
During a session, Outlook remembers the list of users to whom it has
responded. When you restart Outlook, this list is deleted and the rule
is reset to start again for each sender."
So you can't use a rule in Outlook to do what you want unless you
provide a scheduled means of starting and exiting Outlook. Have you
checked if your e-mail provider lets you define server-side rules? Use
the webmail interface your account and check your account's options to
see if you can define server-side rules that will do what you want - but
that also presumes that your e-mail provider does not similarly limit
the number of rule-based replies to the same sender. Auto-responders at
the mail server work similarly to auto-reply in Exchange: one auto-reply
per sender. So you need to find out if your e-mail provider lets you
define a rule that will auto-reply multiple times instead of using their
auto-responder (which might be called something else, like vacation
responder).
Outlook wasn't designed to be a Help/Call Center product, just an e-mail
client with some potent rules and enterprise-level features. You can't
do what you want with Outlook. You can't do what you want with
Exchange, either. Probably not what you wanted to hear.