Sebastian Wiesinger: > I read these but it's not clear to me. So the transport lookup doesn't > work, but why does that prevent postfix from doing a 4xx error code?
You should remove the domains from SQL (or LDAP or other slow tables).
Once you do that, smtpd will reply 4xx after email address lookup
error (it won't reply 4xx when trivial-rewrite can't look up the
domain).
Wietse
