Update templates

templates/etc/dovecot/conf.d/10-logging.conf.j2

@@ -74,11 +74,16 @@ plugin {
 # possible variables you can use.
 #mail_log_prefix = "%s(%u): "
 
-# Format to use for logging mail deliveries. You can use variables:
+# Format to use for logging mail deliveries:
 #  %$ - Delivery status message (e.g. "saved to INBOX")
-#  %m - Message-ID
-#  %s - Subject
-#  %f - From address
-#  %p - Physical size
-#  %w - Virtual size
+#  %m / %{msgid} - Message-ID
+#  %s / %{subject} - Subject
+#  %f / %{from} - From address
+#  %p / %{size} - Physical size
+#  %w / %{vsize} - Virtual size
+#  %e / %{from_envelope} - MAIL FROM envelope
+#  %{to_envelope} - RCPT TO envelope
+#  %{delivery_time} - How many milliseconds it took to deliver the mail
+#  %{session_time} - How long LMTP session took, not including delivery_time
+#  %{storage_id} - Backend-specific ID for mail, e.g. Maildir filename
 #deliver_log_format = msgid=%m: %$