Calling send() in loop with 11+ iterations causes memory leak warning

Getting the following when I fire off emails inside a loop with 11+ iterations (i.e., 10 or fewer iterations doesn't generate this warning):

c$ node mailer-test.js
(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace: 
    at SMTPClient.<anonymous> (events.js:133:17)
    at SMTPClientPool.send (/Users/c/dev/mailer-test/node_modules/mailer/lib/node_mailer.js:72:10)
    at dispatchMail (/Users/c/dev/mailer-test/node_modules/mailer/lib/node_mailer.js:112:12)
    at Object.node_mail [as send] (/Users/c/dev/mailer-test/node_modules/mailer/lib/node_mailer.js:159:5)
    at Object.<anonymous> (/Users/c/dev/mailer-test/mailer-test.js:5:10)
    at Module._compile (module.js:425:26)
    at Object..js (module.js:443:10)
    at Module.load (module.js:344:31)
    at Function._load (module.js:303:12)
    at Array.0 (module.js:463:10)

To be clear, everything works (emails are sent)--just reporting the memory leak warning. Maybe a false positive?

Tested with mailer 0.6.7 and node 0.5.7 (darwin) / 0.6.3 (win32) using the following:

var mailer = require('mailer');

for(var i = 0; i < 11; i++) { // Change 11 to 10 and warnings no longer appear
  mailer.send({
      to: 'Some Body <someone@somewhere.com>',
      from : 'Me <me@somewhereelse.com>',
      subject: 'Test '+i,
      body: 'Blah',
      host : "xxx", 
      port : "465",
      ssl: true,
      authentication : "login",
      username : "xxx",
      password : "yyy"
    },
    function(err, result){
      if(err){ console.log(err); }
    }
  );
}

Reproduce the warning with the provided mailer-test.js loop using 11 sends, then inspect lib/node_mailer.js at SMTPClientPool.send (line 72), dispatchMail (line 112), and node_mail (line 159). Trace how listeners are registered and removed, and verify that repeated sends complete without the EventEmitter warning while preserving the existing callbacks and email delivery.