yes, just make sure to use the same name for each of the checkboxes, and end the name with "[]". for example:
<label>
<input type="checkbox" name="toEmail[]" value="support@myCompany.com" id="toEmail_0" />
support</label>
<br />
<label>
<input type="checkbox" name="toEmail[]" value="sales@myCompany.com" id="toEmail_1" />
sales</label>
<br />
<label>
<input type="checkbox" name="toEmail[]" value="info@myCompany.com" id="toEmail_2" />
info</label>
this will create an array of each of select checkboxes.
then In universal email, use the following code for the two address:
<?php echo((isset($_POST["toEmail"]))?implode(", ",$_POST["toEmail"]):"") ?>
this use the php implode function to convert the array to a comma separated list