Q0319
Dean Hamstead edited this page Aug 18, 2016
·
3 revisions
I have some mails on my queues that are sticking around longer than the retry time indicates they should. They are all getting frozen because some remote admin has set their MX record to 127.0.0.1.
The admin in question is an idiot. Exim will always freeze such messages because they are apparently routed to the local host. To bounce these messages immediately, set
ignore_target_hosts = 127.0.0.1
on the dnslookup router. This causes Exim to completely ignore any hosts with that IP address. In fact, there are quite a number of IP addresses that should never be used. Here is a suggested configuration list for the IPv4 ones:
# Don't allow domains whose single MX (or A) record is a
# "special-use IPv4 address", as listed in RFC 3330.
ignore_target_hosts = \
# Hosts on "this network"; RFC 1700 (page 4) states that these
# are only allowed as source addresses
0.0.0.0/8 : \
# Private networks, RFC 1918
10.0.0.0/8 : 172.16.0.0/12 : 192.168.0.0/16 : \
# Carrier NAT, RFC6598
100.64.0.0/10 : \
# Internet host loopback address, RFC 1700 (page 5)
127.0.0.0/8 : \
# "Link local" block
169.254.0.0/16 : \
# "TEST-NET-1" - should not appear on the public Internet
192.0.2.0/24 : \
# "TEST-NET-2" - should not appear on the public Internet
198.51.100.0/24 : \
# 6to4 relay anycast addresses, RFC 3068
192.88.99.0/24 : \
# Network interconnect device benchmark testing, RFC 2544
198.18.0.0/15 : \
# "TEST-NET-3" - should not appear on the public Internet
203.0.113.0/24 : \
# Multicast addresses, RFC 3171
224.0.0.0/4 : \
# Reserved for future use, RFC 1700 (page 4)
240.0.0.0/4
- What do lowest numbered MX record points to local host and *remote
- Why does Exim say all relevant MX records point to non-existent hosts
- How do I configure Exim to send all messages to a central server? I
- How do I configure Exim to send all non-local mail to a gateway host?
- How can I arrange for mail on my local network to be delivered directly
- How do I configure Exim to send all non-local mail to a central server
- The
route_listsetting^foo$:^bar$ $domainin a manualroute - I have a domain for which some local parts must be delivered locally,
- How can I configure Exim on a firewall machine so that if mail arrives
- If a DNS lookup returns no MX records why doesn't Exim just bin the
- When a DNS lookup for MX records fails to complete, why doesn't Exim
- Is it possible to use a conditional expression for the host item in a
- I send all external mail to a smart host, but this means that bad
- I have a really annoying intermittent problem where attempts to mail to
- I'd like route all mail with addresses that can't be resolved (the DNS
- I would like to forward all incoming email for a particular domain to
- What I'd like to do is have alternative smart hosts, where the one to be
- Exim won't route to a host with no MX record.
- I have some mails on my queues that are sticking around longer than the
- How can I arrange for all mail to
- How can I tell an Exim router to use only IPv4 or only IPv6 addresses
- How can I reroute all messages bound for 192.168.10.0 and 10.0.0.0 to a