As documented in the release notes and UPDATING, the following changes
accompanies the merge of sendmail 8.15.2 to HEAD:
sendmail has been updated to 8.15.2. Starting with FreeBSD 11.0
and sendmail 8.15, sendmail uses uncompressed IPv6 addresses by
default, i.e., they will not contain "::". For example, instead
of ::1, it will be 0:0:0:0:0:0:0:1. This permits a zero subnet
to have a more specific match, such as different map entries for
IPv6:0:0 vs IPv6:0. This change requires that configuration
data (including maps, files, classes, custom ruleset, etc.) must
use the same format, so make certain such configuration data is
upgrading. As a very simple check search for patterns like
'IPv6:[0-9a-fA-F:]*::' and 'IPv6::'. To return to the old
behavior, set the m4 option confUSE_COMPRESSED_IPV6_ADDRESSES or
the cf option UseCompressedIPv6Addresses.
Note that when sendmail 8.15.2 is MFC'ed to stable/{10,9,8}, for the sake of
POLA, the default will be to continue using compressed IPv6 addresses as it has
always done. This default change will only affect FreeBSD 11 and later (and
can be changed in your configuration file as described above).
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