# If MAILNAME is an absolute path to a file, the first line of this file
# will be used as the hostname.
#MAILNAME mail.example.net
+
+# Masquerade envelope from addresses with this address/hostname.
+# Use this if mails are not accepted by destination mail servers because
+# your sender domain is invalid.
+# By default, MASQUERADE is not set.
+# Format: MASQUERADE [user@][host]
+# Examples:
+# MASQUERADE john@ on host "hamlet" will send all mails as john@hamlet
+# MASQUERADE percolator will send mails as $username@percolator, e.g. fish@percolator
+# MASQUERADE herb@ert will send all mails as herb@ert
+
+# Directly forward the mail to the SMARTHOST bypassing aliases and local delivery
+#NULLCLIENT