[exim] Filtering remote MX's by IP

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Szerző: Robert Blayzor
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Címzett: exim-users@exim.org
Tárgy: [exim] Filtering remote MX's by IP
We are seeing a lot of mail sitting in queues for bogus MX's that resolve to either RFC1918 space or to just bogus IP's in general. Before we implement, what exactly happens when a message in queue hits this list? Does an NDR get returned to the sender address or is the mail silently discarded? Since this is mostly to prevent some spam/virus backscatter in some cases, is it possible to silently discard?


Config parts in question:

BAD_MX_LIST = <; 0.0.0.0/8 ; 127.0.0.0/8 ; 10.0.0.0/8 ; 172.16.0.0/12 ; \
192.168.0.0/16 ; 224.0.0.0/3 ; 169.254.0.0/16; \
!2000::/3

smtp_routed:
driver = dnslookup
domains = !+local_domains
transport = remote_smtp
ignore_target_hosts = BAD_MX_LIST



--
Robert Blayzor
INOC, LLC
rblayzor@???
http://www.inoc.net/~rblayzor/