+# Uncomment the following line to add OCSP stapling support in TLS, if Exim
+# was built using OpenSSL.
+
+# EXPERIMENTAL_OCSP=yes
+
+# Uncomment the following line to add DMARC checking capability, implemented
+# using libopendmarc libraries.
+# EXPERIMENTAL_DMARC=yes
+# CFLAGS += -I/usr/local/include
+# LDFLAGS += -lopendmarc
+
+# Uncomment the following line to add Per-Recipient-Data-Response support.
+# EXPERIMENTAL_PRDR=yes
+
+# Uncomment the following line to support Transport post-delivery actions,
+# eg. for logging to a database.
+# EXPERIMENTAL_TPDA=yes