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Wikipedia: Trust but Verify

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Old 05-28-2008
Wikipedia: Trust but Verify
Security professionals are, almost by definition, inclined to be skeptical (not to say paranoid) by nature, and among the least likely to say without irony "It must be true, I read it on Wikipedia!" Those of us who specialize in anti-malware research not only share these traits, but are also accustomed to being considered incompetent or downright crooked, not to mention the still widely-held belief that we write all the viruses. (I considered what I think are some of the reasons for all that in an article for Virus Bulletin a couple of years ago, by the way.)
So it's a pleasant surprise to come across a Wikipedia entry that's not only painstakingly accurate (to the point that the author went to the trouble of asking me to check its accuracy), but complimentary towards its subject despite his longstanding association with anti-virus research. :)
Author/reviewer/consultant (etc) Robert Slade's contributions to the common weal are not restricted to anti-virus, of course: his name is well known in (ISC)2 circles, and his longstanding book review project is a seriously useful resource. It's a pleasure to see an old friend and colleague (we wrote a book on viruses together some years ago) get some of the recognition he deserves. Cheers, Rob!


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LEARN ABOUT DEBIAN

mail::verify

Mail::Verify(3pm)					User Contributed Perl Documentation					 Mail::Verify(3pm)

NAME

       Mail::Verify - Utility to verify an email address

SYNOPSIS

	   use Mail::Verify;

DESCRIPTION

       "Mail::Verify" provides a function CheckAddress function for verifying email addresses.	First the syntax of the email address is checked,
       then it verifies that there is at least one valid MX server accepting email for the domain.  Using Net::DNS and IO::Socket a list of MX
       records (or, falling back on a hosts A record) are checked to make sure at least one SMTP server is accepting connections.

ERRORS

       Here are a list of return codes and what they mean:

       0      The email address appears to be valid.

       1      No email address was supplied.

       2      There is a syntaxical error in the email address.

       3      There are no DNS entries for the host in question (no MX records or A records).

       4      There are no live SMTP servers accepting connections for this email address.

EXAMPLES

       This example shows obtaining an email address from a form field and verifying it.

	 use CGI qw/:standard/;
	 use Mail::Verify;
	 my $q = new CGI;
	 [...]
	 my $email = $q->param("emailaddr");
	 my $email_ck = Mail::Verify::CheckAddress( $email );
	 if( $email_ck ) {
	     print '<h1>Form input error: Invalid email address.</h1>';
	 }
	 [...]

perl v5.8.8							    2002-06-09							 Mail::Verify(3pm)