Outlook 2007, how to stop accidental replies from a certain folder?

I have my college's email account auto-forwarded (they don't offer pop3
or imap) to my main gmail account so I don't have to go to their
website to check for mail. That gmail account, and others, use pop3
down to my Outlook 2007. In my Outlook, I have a rule that puts mail
sent to my @college address into a folder named Collegemail.

Since the college email system lacks pop3 or imap, I have to go to
their site to send a reply, so that the reply will be sent from my
@college email address. The problem is that since I don't get very many
emails to that address, I cannot seem to get into the habit of going to
my college's website to make those replies. So quite often I
absent-mindedly make the replies while in Outlook, which means my
replies are sent "from" the @gmail address that the @college emails
were forwarded to.

I'm hoping there's a solution. Can I set up Outlook to either 1)
disable replying to emails in the Collegemail folder or to emails where
my college email address is in the original To: line, or else 2) set it
to send those replies from a non-functional dummy account? The dummy
account would be unable to send the email so the email would be stuck
in the Outbox. (I already have the non-functional dummy account set up
as Outlook's "Default" account. When I compose a new mail I have to
deliberately pick one of my good accounts to send the new mail with, or
else Outlook uses the default dummy account and the email stays in the
Outbox with a Send error.)

Thanks.




--
hosmal