From 6b4b815849afa945080834ec50f78c067783f53f Mon Sep 17 00:00:00 2001
From: Subhendu Ghosh <sghosh@users.sourceforge.net>
Date: Sun, 1 Sep 2002 16:18:29 +0000
Subject: Valid MAIL command

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@85 f882894a-f735-0410-b71e-b25c423dba1c

diff --git a/plugins/check_smtp.c b/plugins/check_smtp.c
index 2d2e289..f96db49 100644
--- a/plugins/check_smtp.c
+++ b/plugins/check_smtp.c
@@ -49,8 +49,11 @@
  * to do something useful. This can be prevented by giving a command
  * even if syntax is illegal (MAIL requires a FROM:<...> argument)
  * You can disable sending DUMMYCMD by undefining SMTP_USE_DUMMYCMD.
+ *
+ * According to rfc821 you can include a null reversepath in the from command
+ * - but a log message is generated on the smtp server.
  */
-#define SMTP_DUMMYCMD  "MAIL\r\n"
+#define SMTP_DUMMYCMD  "MAIL FROM:<>\r\n"
 #define SMTP_USE_DUMMYCMD 1
 #define SMTP_QUIT	"QUIT\r\n"
 
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