+# Uncomment the following line to support Events,
+# eg. for logging to a database.
+# EXPERIMENTAL_EVENT=yes
+
+# Uncomment the following line to add Redis lookup support
+# You need to have hiredis installed on your system (https://github.com/redis/hiredis).
+# Depending on where it is installed you may have to edit the CFLAGS and LDFLAGS lines.
+# EXPERIMENTAL_REDIS=yes
+# CFLAGS += -I/usr/local/include
+# LDFLAGS += -lhiredis
+
+# Uncomment the following line to enable support for checking certificate
+# ownership
+# EXPERIMENTAL_CERTNAMES=yes
+
+# Uncomment the following line to add DANE support
+# Note: Enabling this unconditionally overrides DISABLE_DNSSEC
+# EXPERIMENTAL_DANE=yes
+
+# Uncomment the following to include extra information in fail DSN message (bounces)
+# EXPERIMENTAL_DSN_INFO=yes