I am experimenting with postfix on an Android phone and however it works on ipv4 but for ipv6 it fails and the reason is that under a restricted environment, access to the aforementioned file is not available. Apparently, mobile networks have better support for ipv6 than ipv4.
$ postfix start postfix: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postsuper: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/lib/postfix/. postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/lib/postfix/./master.lock postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/active postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/bounce postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/corrupt postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/defer postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/deferred postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/flush postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/hold postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/incoming postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/private postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/public postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/saved postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/trace postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by postfix: /var/spool/postfix/maildrop postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by group postdrop: /usr/sbin/postqueue postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by group postdrop: /usr/sbin/postdrop postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by group postdrop: /var/spool/postfix/public postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: warning: not owned by group postdrop: /var/spool/postfix/maildrop postfix/postlog: warning: can't open /proc/net/if_inet6 (Permission denied) - skipping IPv6 configuration postfix/postfix-script: starting the Postfix mail system
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