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POPerl Script for Email validation?
 

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    <p>I've created a perl script to validate email ids for my marketing team to send campaigns.</p> <p>The script is behaving erratically.</p> <p>For Example, I had validated 135 email ids on various dates,</p> <pre><code>****************************************** Date | Valid | Invalid | Total ****************************************** 23-Dec-13 45 | 90 | 135 ****************************************** 24-Dec-13 90 | 45 | 135 ****************************************** 25-Dec-13 133 | 02 | 135 ****************************************** </code></pre> <p>I'm unable to figure out where it went wrong,</p> <p><a href="https://github.com/bcrajkumar/techstuff/commit/8af92f1c60c7da6eddd4fa2f9705a87e52b25692" rel="nofollow">Link to code</a></p> <p>Code:</p> <pre><code> #!/usr/bin/perl use Data::Dumper; %lookup_cache = (); sub valid_address { my($addr) = @_; my($domain, $valid); # Lower-case address $addr = lc($addr); # Validate format of address return(0) unless ($addr =~ /^[^@]+@([-\w]+\.)+[a-z]{2,4}$/); # Grab domain $domain = (split(/@/, $addr))[1]; # Lookup and return cached result if it exists $cached_result = $lookup_cache{$domain}; if ($cached_result ne '') { #print "[cached_result] "; return $cached_result; } # Do domain lookup $valid = 0; if (open(DNS, "nslookup -q=any $domain |")) { while (&lt;DNS&gt;) { $valid = 1 if (/^$domain.*\s(mail exchanger|internet address)\s=/i); } } # Store cached result for later $lookup_cache{$domain} = $valid; return $valid; } while (&lt;&gt;) { $addy = $_; $addy =~ s/\s+$//; if ($addy) { print "$addy " . (valid_address($addy) ? 'valid' : 'invalid') . "\n"; } } </code></pre>
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