don't deliver emails if SA is down

[sehh]

How can i force Exim to NOT deliver an email if it doesn't get scanned by Spamassassin?

Right now, it seems that if SA is down or has some other problem, Exim still delivers the email. This means that 1 out of 10 spam goes through.

Anyone knows how to do that?

PS:
this is the default in postfix, it never delivers emails if SA hasn't scanned them.

[sehh]

The problem:
Because the "spam = ${acl_m1}" line is within a "warn" statement, if SA scanning fails for any reason (spamd dies, connection failure, overloaded SA that reached max connections, etc) then instead of rejecting the email, its accepted.

Here is a possible solution:
Edit /etc/exim.conf, search for the string "detected message as spam" and the above "warn" statement change it to "deny".

So it should look like:

  deny
    condition = ${if eq {${acl_m0}}{1}{1}{0}}
    spam =  ${acl_m1}
    log_message = "SpamAssassin as ${acl_m1} detected message as spam ($spam_score)"
    ...

if SA fails for any reason, the email should be rejected with a temporary failure, thus request the remote server to re-send the email again at a later time, so you won't loose any real emails.