The problem occurs when there is an entry in local_host_blacklist that is a domain for which the lookup returns a SERVFAIL.
I rigged a DNS record so you can test this: add fail.30hopsmax.at to
local_host_blacklist. As long as that entry is there, every icoming
email (not only for this one domain) is rejected with a 451 temporary
error.
One problem is that the documentation explicitly states that hostnames
are fine:
exim4_files(5)
/etc/exim4/local_host_blacklist
is an optional file containing a list of IP addresses,
networks and host names [...]
conf.d/acl/30_exim4-config_check_rcpt (and exim4.conf.template)
# deny bad sites (IP address)
# CONFDIR/local_host_blacklist holds a list of host names [...]
Should this be considered a documentation bug?
hop
--
What should you do to a blue elephant? Cheer it up.
smime.p7s
Description: S/MIME cryptographic signature
