A possible solution: Adding flexibility to an email address field.
Ideally there should be an email address field where we could specify both the name and the email address in two separate fields so that only the actual name would be displayed.

One quick fix to this problem is to modify the index.php file. Although this fix will not result in the email address being hidden, it will add the ability to specify both a name and email address in the same field, and to disguise or encode the email address itself.

By adding the following code, you get the following new functionality:

1) You can use "(at)", "(dot)" and insert spaces anywhere you want in the email address. For example:
ideas(at)lime survey(dot)org

2) You can specify an email address which is hex encoded. It's not a sophisticated encoding. For example, ideas@limesurvey.org would be 6964656173406c696d657375727665792e6f7267 (not case sensitive)

3) You can specify both a name and an email address by placing the email address between square brackets. For example: Great Ideas [ideas@limesurvey.org]

NOTE: You can use any combination of the above three options. Of course the hex version of the address is only useful if you combine it with #3 above. For example:

Great Ideas [6964656173406c696d657375727665792e6f7267]

So, here is how to implement this solution:

==== File to be modified: index.php ====

STEP 1: Add the following function right above the "sendsubmitnotification" function:

function extractemailaddress($address) // by Michael Milette (2010-10-27)

// eliminate everything outside of and including square brackets, if applicable
$start = strpos($address,'[');
if ($start > 0 && $start < strlen($address))
$end = strpos($address,']',$start+1);
if ($start > 0 && $start+1 < $end-1)
$address = substr($address,$start+1,$end-$start-1);

// Decode back to string if the email address is hex encoded
if (ctype_xdigit($address))
$address = preg_replace('#(\w)(\w)#e', "chr(hexdec('$1$2'))", $address);

// replace (at) with @, the (dot) with . and remove all spaces
$address = str_replace('(at)','@',$address);
$address = str_replace('(dot)','.',$address);
$address = str_replace(' ','',$address);

return $address;

STEP 2: modify the "sendsubmitnotification" function by adding in $ert=extractemailaddress($ert); as follows:

//Now check each of the email addresses that they are valid before creating/adding to the $emailresponseto array
foreach($emailresponsetos as $ert)

$ert=extractemailaddress($ert);
if(validate_email($ert))

  $emailresponseto[]=$ert;

That's it. You could also add a tool somewhere on the webpage to help users encode email addresses. Here is a simple Javascript function I wrote to do the encoding:

// Convert characters in a string of text to hexadecimal string
function String2Hex(txtString)
var hex = '';
for(var i=0;i<txtString.length;i++)
var h = txtString.charCodeAt(i).toString(16);
while(h.length<2) h="0"+h;
hex += h;

return hex;

Please feel free to contact me if you have any questions.

Thanks again for all your time and effort.

With best regards,

Michael Milette
TNG Consulting Inc.
www.tngconsulting.ca