lmtp: local: Added structural comments.

src/lmtp/lmtp-local.c

@@ -27,6 +27,14 @@
 #define ERRSTR_TEMP_MAILBOX_FAIL "451 4.3.0 <%s> Temporary internal error"
 #define ERRSTR_TEMP_USERDB_FAIL_PREFIX "451 4.3.0 <%s> "
 
+/*
+ * LMTP local
+ */
+
+/*
+ * Recipient
+ */
+
 void client_rcpt_anvil_disconnect(const struct mail_recipient *rcpt)
 {
 	const struct mail_storage_service_input *input;
@@ -63,6 +71,10 @@ client_rcpt_fail_all(struct client *client)
 	}
 }
 
+/*
+ * RCPT command
+ */
+
 static int
 lmtp_rcpt_to_is_over_quota(struct client *client,
 			   const struct mail_recipient *rcpt)
@@ -165,6 +177,10 @@ void rcpt_anvil_lookup_callback(const char *reply, void *context)
 	client_input_handle(client);
 }
 
+/*
+ * DATA command
+ */
+
 static int
 client_deliver(struct client *client, const struct mail_recipient *rcpt,
 	       struct mail *src_mail, struct mail_deliver_session *session)