VBO mass email via local email client
try integrating the Views Send Module, the instructions specifically mention VBO:


  Views Send enables you to send mass mailing from a View.



Since you aren't able to install new modules, it could be done this way:


Create the view as a table of fields, include the email address as EMAIL PLAIN TEXT
add the VBO field, Save Content (you can choose anything you want, but this seems the least offensive)
add some css:

#views-form-email-test-page #edit-select {   display:none; }


This will hide the VBO button since we are overriding its functionality manually
add a header, Global Text:

&lt;button type="button" onclick="emailUsers(); return false;"&gt;email users&lt;/button&gt;

add a modified version (modified for view and field names) of this JS to your html.tpl.php, or drupal_add_js, or by whatever other means you want:

function emailUsers()
{
    var toField = '';

    jQuery('#views-form-email-test-page table tbody tr').each(function()
    {
        if(jQuery('.views-field-views-bulk-operations div input', this).is(':checked'))
        {
            toField += jQuery('.views-field-field-address', this).html() + ',';
        }
    });

    if(toField.length &gt; 0) window.location.href = "mailto:" + toField;
    else alert('Please select at least one user to email!');
}



This all assumes:


the View machine name is name email_test
the View is a page
the field holding the email address is field_address 


EDIT FROM OP:


  Thank you very much Geoff, your solution works very well, I've learned
  a few things and I hope it will be usefull for others in the futures,
  indeed I was quite surprised not to find anything when I searched
  befor posting. Since my email field was also a link I've used the
  following code
  
  tmp = jQuery('.views-field-field-applicant-email', this).html(); tmp2
  = jQuery(tmp.replace('mailto:','')); toField += jQuery(tmp2).attr('href') + ',';
  
  instead of
  
  toField += jQuery('.views-field-field-address', this).html() + ',';
  
  not very elegant may be (I'm not a programmer) but it works! for some
  strange reasons I cannot upvote your answer, sorry.