Works for me except I had to initialize $email_list, initialize $error_message and print $error_message. Could you provide a snippet that actually shows the error?

There are a couple of details worth mentioning.

• split( /\n/, ... )
  [download]

  is easier to read than

  split( /
  /, ... )
  [download]

• ... if( $error > 0 );
  [download]

  or just

  ... if $error;
  [download]

  is easier to read than

  ... unless( $error < 1 );
  [download]

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