Re: [exim] Backscatterer blocking

> From: Marti Markov

> RCPT TO: NoSuchUser@???
> 250 Accepted

> Restarted exim and I started getting this:

> RCPT TO: NoSuchUser2@???
> 550 Unrouteable address

You must use "require verify = recipient" in your rcpt ACL
before the first "accept" (except relay_from_hosts and authenticated).
Perhaps you added it, but didn't restart Exim then.

If you always had "verify = repipient" then perhaps sometimes
your LDAP errorneoulsy replies that "NoSuchUser" exists
during rcpt ACL, then replies correctly while trying to send a bounce.