##
# Address to use when sending rejection mails.
-# Default is postmaster@<your domain>.
+# Default is postmaster@<your domain>. %d expands to recipient domain.
#postmaster_address =
-# Hostname to use in various parts of sent mails, eg. in Message-Id.
-# Default is the system's real hostname.
+# Hostname to use in various parts of sent mails (e.g. in Message-Id) and
+# in LMTP replies. Default is the system's real hostname@domain.
#hostname =
# If user is over quota, return with temporary failure instead of