php mail option custom code

I am trying send multiple emails to database.
Is running OK using this:

CUSTOM CODE In SUBMIT-----

$results = array();
foreach ( $form->data['coles'] as $v ) {
  $to = $v[co_m_director];
  $subject = "My subject";
  $txt = "Hello world!";
  $headers = "From: noreply@programasi.org" . "\r\n";
  mail($to,$subject,$txt,$headers);

But i have two questions:
1. If i send 100 mails can i have problems
2. But i would like show the result at same window one to one.

Like this:
echo $mail . "send to $customer , OK


--- mail send to mail1@domain.com ---
--- mail send to mail2@domain2.com ---
--- mail send to mail3@domain3.com ---

Finish (3 mails sended)

Hi ideagrup,

1. Possibly, ChronoForms should be OK but you may hit limits on your mail service.

2. In the for each loop, add a value to the $results array and, at the end of the loop, display the results. Something like this:

echo implode("\n", $results);

Bob