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Full Discussion: Unix Command for finding Nul Characters
Top Forums UNIX for Dummies Questions & Answers Unix Command for finding Nul Characters Post 70526 by fundidor on Saturday 30th of April 2005 10:21:29 AM
Old 04-30-2005
Unix Command for finding Nul Characters
Hi Folks,


I have this windowed applescript application I use for sending out emails, it uses the Postfix daemon buit into my Mac Os X box, and a 3 SMTP servers (out of hundreds I send emails to) were refusing my messages replying "host smtp2.braspress.com.br[200.187.158.140] said: 550 Requested action not taken: NUL characters are not allowed. (in reply to end of DATA command)"

As a novice high-level programmer, I did not know that every character is represented by a hex value, and that I had two "gremlins" in my Template text (used to send out the emails after text manipulation), I mean, I had two hex values = 00.

A experienced Objective C programmer, friend of mine, taught me the what these Nul characters are and helped me removing these from my text. I was using a text application that did not show me the little gremlins.

As I move on forward with my learning, I am wondering if there is a Unix command I can use to detect these Gremlins, and so create a routine in my application to check the consistency of any text I use for sending out emails.

I thank you for your comments,

Bernardo Höhl
Rio de Janeiro - Brazil
 

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LEARN ABOUT SUSE

mail::spamassassin::plugin::phishtag

Mail::SpamAssassin::Plugin::PhishTag(3) 		User Contributed Perl Documentation		   Mail::SpamAssassin::Plugin::PhishTag(3)

NAME

       PhishTag - SpamAssassin plugin for redirecting links in incoming emails.

SYNOPSIS

	loadplugin     Mail::SpamAssassin::Plugin::PhishTag

	trigger_ratio	 0.1
	trigger_target	 RULE_NAME  http://www.antiphishing.org/consumer_recs.html

DESCRIPTION

       PhishTag enables administrators to rewrite links in emails that trigger certain tests, preferably anti-phishing blacklist tests. The plugin
       will inhibit the blocking of a portion of the emails that trigger the test by SpamAssassin, and let them pass to the users' inbox after the
       rewrite. It is useful in providing training to email users about company policies and general email usage.

OPTIONS

       The following options can be set by modifying the configuration file.

       o   trigger_ratio percentage_value

	   Sets the probability in percentage that a positive test will trigger the email rewrite, e.g. 0.1 will rewrite on the average 1 in 1000
	   emails that match the trigger.

       o   trigger_target RULE_NAME http_url

	   The name of the test which would trigger the email rewrite; all the URLs will be replaced by http_url.

DOWNLOAD

       The source of this plugin is avaliable at: http://umut.topkara.org/PhishTag/PhishTag.pm a sample configuration file is also available:
       http://umut.topkara.org/PhishTag/PhishTag.cf

SEE ALSO

       Check the list of tests performed by SpamAssassin to modify the configuration file to match your needs from
       http://spamassassin.apache.org/tests.html

AUTHOR

       Umut Topkara, 2008, <umut@topkara.org> http://umut.topkara.org

COPYRIGHT AND LICENSE

       This plugin is free software; you can redistribute it and/or modify it under the same terms as SpamAssassin itself, either version 3.2.4
       or, at your option, any later version of SpamAssassin you may have available.

perl v5.12.1							    2010-03-16				   Mail::SpamAssassin::Plugin::PhishTag(3)
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