I'm running Perl 5.6.0 on Linux and am getting warnings in my browser when I run my Perl programs:

Um, then stop printing the warnings to your browser :)

I placed the following code in my Perl program, but it does not seem to affect external modules such as sendmail...

That's because warnings are a "lexical" pragma ({ no warnings 'all'; 'does not affect'; { use warnings; 'code here'}}).

perldoc perlrun
...
 -W   Enables all warnings regardless of "no warnings" or "$^W". See the
      perllexwarn manpage.

 -X   Disables all warnings regardless of "use warnings" or "$^W". See
      the perllexwarn manpage.

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