We've had some messages rejected from Fasthosts' MX mail servers with an
error like this:
----------
550 5.7.1 Service unavailable; client [188.65.177.237] blocked using
dbl.spamhaus.org
----------
dbl.spamhaus.org doesn't list IP addresses, so I'm not sure what's going
on. I don't know if someone has gone a bit mad and added all the DNS
blacklists they can find to their spamfilter, not realising that
dbl.spamhaus.org is a domain blacklist, not an IP blacklist.
When you do query dbl.spamhaus.org with an IP address, it gives a
response which could be interpreted as meaning the IP address is listed,
so that could be why the messages are being blocked.
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