Svcheck -- A CGI
based Third Party Relay Checker --
Svcheck is a CGI program which checks a third party relay or an open
relay by connecting to a target SMTP server. Since Svcheck
tries to relay E-mail more than 20 patterns, the users can investigate
weakness of their servers widely. Svcheck is easy to
All the users have to do is input a target hostname and push the check
Svcheck also supports localized messages based on a message catalog (IEEE
Std 1003.1-2001 aka POSIX.1). The users can use
Svcheck in their mother tongue. Since Svcheck automatically
select a language of each message by "Accept-Language:" field in HTTP
request, the users transparently see Svcheck web page in
their mother tongue. We have already made the Japanese
message catalog and the English message catalog. Your
contribution for language supports are welcome.
This program is developed on FreeBSD 5.x and some FreeBSD specific
functions, such as arc4random, are used. However, these
functions might be replaced easily and the providers who use other
operating systems can use this program by little changes.
You can try this program in http://www.rbl.jp/.
First version of Svcheck program appeared in March 15th,
2002. At this time, Svcheck is a command line program whose
argument is a target hostname. A CGI version appeared in
2002. Supports localized messages, such as Japanese, in March
All programs are refactored in May 7th, 2004. Source codes
became public in January 21th, 2005.
Yoshisato YANAGISAWA and Tadashi SUZUKI.
The compilation of software known as Svcheck is distributed
under the following terms:
Copyright (C) 2002-2005 The
All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, are permitted provided that the following
conditions are met:
- Redistributions of source code must retain the above
copyright notice, this list of conditions and the following disclaimer.
- Redistributions in binary form must reproduce the above
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
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