Milters should always be started before MTAs else the failure to connect will log errors and postfix will give tempfail rejection per milter_default_action default setting while sendmail will ignore by default. Add "before mta" to depend() in rmilter.initd files.
Thanks for reporting! Fixed in the tree: [master 2b90e94] mail-filters/rmilter: start before mta (fixes bug 605592) 2 files changed, 72 insertions(+) create mode 100644 mail-filter/rmilter/files/rmilter.initd-r2 create mode 100644 mail-filter/rmilter/rmilter-1.10.0-r2.ebuild