I've been experimenting with some different configurations of my spam
blocking filters and have run across what I think is a bug in 1.70, or
at least undocumented behaviour. I've been trying to use
sender_host_reject to tune my exim to reject connections from some of
the larger dial-ups, as they are the major sources of spam. Currently,
the ones I've been trying to block are *.ms.uu.net and
*.dial-ip.psi.net. However, when I use the following line in configure,,
sender_host_reject = "lsearch;/opt/exim/etc/reject.hosts"
I find 1.70 adds an unexpected feature. If it can't do a reverse lookup
on the connecting address, it rejects it.
host_find_by_addr failed for 204.157.168.3
failed to get host name for 204.157.168.3 in verify_check_host:
returning 1
LOG: 1 MAIN REJECT
connection from [204.157.168.3] (root) refused (reject host)
554 SMTP service not available
This is unfortunately a bit too strict for me. I've looked through the
new documentation for 1.70 and I don't see this additional behaviour
documented, and I also can't find any way to turn it off. Is this this
intended behaviour? It seems opposite to the implied intention of only
rejecting a connection if the reverse matches a host in
sender_host_reject.
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