Using Syslog is the new standard. It is not optional anymore.

core/postfix/conf/main.cf

@@ -2,11 +2,6 @@
 # General
 ###############
 
-{% if POSTFIX_LOG_SYSLOG != "local" %}
-# Logging configuration
-maillog_file = /dev/stdout
-{% endif %}
-
 # Main domain and hostname
 mydomain = {{ DOMAIN }}
 myhostname = {{ HOSTNAMES.split(",")[0] }}

core/postfix/start.py

@@ -82,12 +82,11 @@ if "RELAYUSER" in os.environ:
     conf.jinja("/conf/sasl_passwd", os.environ, path)
     os.system("postmap {}".format(path))
 
-if os.environ["POSTFIX_LOG_SYSLOG"] == "local":
-    # Configure and start local rsyslog server
-    conf.jinja("/conf/rsyslog.conf", os.environ, "/etc/rsyslog.conf")
-    os.system("/usr/sbin/rsyslogd -n &")
-    # Configure logrotate
-    if os.environ["POSTFIX_LOG_FILE"] != "":
+# Configure and start local rsyslog server
+conf.jinja("/conf/rsyslog.conf", os.environ, "/etc/rsyslog.conf")
+os.system("/usr/sbin/rsyslogd -n &")
+# Configure logrotate
+if os.environ["POSTFIX_LOG_FILE"] != "":
     conf.jinja("/conf/logrotate.conf", os.environ, "/etc/logrotate.d/postfix.conf")
     if os.path.exists("/overrides/logrotate.conf"):
         shutil.copyfile("/overrides/logrotate.conf", "/etc/logrotate.d/postfix.conf")

docs/configuration.rst

@@ -268,9 +268,8 @@ Mail log settings
 By default, all services log directly to stdout/stderr. Logs can be collected by any docker log processing solution.
 
 Postfix writes the logs to a syslog server which logs to stdout. This is used to filter out messages from the healthcheck.
-In some situations, a separate mail log is required (e.g. for legal reasons). The syslog server can be configured to write log files to a volume. It can be configured by the following options:
+In some situations, a separate mail log is required (e.g. for legal reasons). The syslog server can be configured to write log files to a volume. It can be configured with the following option:
 
-- ``POSTFIX_LOG_SYSLOG`` (default: ``local`` ): Set to ``local`` (default) to enable the syslog server. Set to ``disable`` to disable the syslog server. If disabled, Postfix will log directly to stdout and the healthcheck messages will not be filtered out.
 - ``POSTFIX_LOG_FILE``: The file to log the mail log to. When enabled, the syslog server will also log to stdout.
 
 When ``POSTFIX_LOG_FILE`` is enabled, the logrotate program will automatically rotate the logs every week and keep 52 logs.

towncrier/newsfragments/1441.feature

@@ -1,9 +1,6 @@
-Introduces postfix logging via rsyslog with these features:
+Introduces postfix logging via syslog with these features:
 - stdout logging still enabled
 - internal test request log messages (healthcheck) are filtered out by rsyslog
 - optional logging to file via POSTFIX_LOG_FILE env variable
-To use it configure in mailu.env
-- ``POSTFIX_LOG_SYSLOG``: (default: ``local``) set to ``local`` (Default) to enable a local syslog server for postfix. Set to ``disable``to disable.
+To use logging to file configure in mailu.env
 - ``POSTFIX_LOG_FILE``: The file to log the mail log to
-Not disabling POSTFIX_LOG_SYSLOG is recommended to get rid of internal healtcheck messages.
-