milter support

Dockerfile

@@ -47,6 +47,10 @@ ENV SMTP_TLS_MANDATORY_PROTOCOLS=""
 ENV SMTP_TLS_NOTE_STARTTLS_OFFER=""
 ENV SMTP_TLS_SECURITY_LEVEL=""
 ENV SMTP_TLS_SESSION_CACHE_DATABASE=""
+ENV SMTPD_MILTERS=""
+ENV NON_SMTPD_MILTERS="\$smtpd_milters"
+ENV MILTER_DEFAULT_ACTION=accept
+ENV INTERNAL_MAIL_FILTER_CLASSES=bounce
 
 # TODO: template access lists
 

confd/conf.d/setup_milter.toml

@@ -0,0 +1,10 @@
+[template]
+src = "setup_milter.tmpl"
+dest = "/start.d/setup_milter"
+mode = "0755"
+keys = [
+"/smtpd/milters",
+"/non/smtpd/milters",
+"/milter/default/action",
+"/internal/mail/filter/classes",
+]

confd/templates/setup_milter.tmpl

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+{{ with getv "/smtpd/milters" }}postconf smtpd_milters='{{.}}'{{ end }}
+{{ with getv "/non/smtpd/milters" }}postconf non_smtpd_milters='{{.}}'{{ end }}
+{{ with getv "/milter/default/action" }}postconf milter_default_action='{{.}}'{{ end }}
+{{ with getv "/internal/mail/filter/classes" }}postconf internal_mail_filter_classes='{{.}}'{{ end }}