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From: Graham Murray on 6 May 2008 06:24
One of my systems I administer running sendmail 8.14.2 has IPv6
enabled. I am happy to receive incoming connections (ie sendmail acting
as server) on IPv6 but want all outgoing connections (ie sendmail as
client) to use IPv4[1].

In the .mc file I have set

DAEMON_OPTIONS(`Family=inet6')dnl
CLIENT_OPTIONS(`Family=inet')dnl

and the .cf reflects this. But it still uses IPv6 when connecting to a
server which lists a host with an AAAA as the MX.

[1] As the IPv6 interface uses the 6to4 tunnel mechanism so has no
reverse DNS.
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