CVS: tmda/contrib ChangeLog,1.101,1.102 smtp-check-sender,1.2,1.3

Update of /cvsroot/tmda/tmda/contrib
In directory sc8-pr-cvs1:/tmp/cvs-serv30942

Modified Files:
	ChangeLog smtp-check-sender 
Log Message:
Bugfix. Change the default probe address to <> instead of
[email protected].  <> is what most MTAs (e.g, Exim) use for their
address verification feature.  The comments now recommend the
user either stick with <> or use a valid address to probe with.

[email protected] was a bad choice because some sites refuse mail from
example.com since this domain (intended for example usage only) is
often exploited by spammers.  In smtp-check-sender, this can result
in a false negative since the probe might return a 5XX even for a
valid address if the MX refuses mail from example.com.  The following
traceback illustrates:

justine:/tmp> echo | smtp-check-sender [email protected]
send: 'helo justine.libertine.org\r\n'
reply: '250 jimsun.LinxNet.com\r\n'
reply: retcode (250); Msg: jimsun.LinxNet.com
send: 'mail from: <[email protected]>\r\n'
reply: '250 Ok\r\n'
reply: retcode (250); Msg: Ok
send: 'rcpt to: <[email protected]>\r\n'
reply: '554 Service unavailable; Sender address [[email protected]] blocked using spamdomains.blackholes.easynet.nl; For testing purposes only - 127.0.0.2 block record\r\n'
reply: retcode (554); Msg: Service unavailable; Sender address [[email protected]] blocked using spamdomains.blackholes.easynet.nl; For testing purposes only - 127.0.0.2 block record
send: 'quit\r\n'
reply: '221 Bye\r\n'
reply: retcode (221); Msg: Bye
BAD sender



Index: ChangeLog
===================================================================
RCS file: /cvsroot/tmda/tmda/contrib/ChangeLog,v
retrieving revision 1.101
retrieving revision 1.102
diff -u -r1.101 -r1.102
--- ChangeLog	31 Jul 2003 20:09:32 -0000	1.101
+++ ChangeLog	1 Oct 2003 22:28:38 -0000	1.102
@@ -1,3 +1,8 @@
+2003-10-01  Jason R. Mastaler  <[email protected]>
+
+	* smtp-check-sender (data): Change the default probe address to
+	the empty envelope sender <>.
+	
 2003-07-31  Tim Legant  <[email protected]>
 
 	* vmailmgr-vdir.sh: Apparently the listvdomain program doesn't

Index: smtp-check-sender
===================================================================
RCS file: /cvsroot/tmda/tmda/contrib/smtp-check-sender,v
retrieving revision 1.2
retrieving revision 1.3
diff -u -r1.2 -r1.3
--- smtp-check-sender	26 Aug 2003 20:03:47 -0000	1.2
+++ smtp-check-sender	1 Oct 2003 22:28:39 -0000	1.3
@@ -76,7 +76,11 @@
 if len(sys.argv) < 2:
     sys.exit(1)
 
-mail_from_address = '[email protected]'
+# Make sure you either take the default of '' (meaning probe with an
+# empty envelope sender <>), or use a valid address for this variable,
+# otherwise you risk losing mail.
+mail_from_address = ''
+
 address_to_verify = sys.argv[1]
 verify_hostname = address_to_verify.split('@', 1)[1]
 

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