Does Email with Debug on Mean an Error?

Someone suggested that for Paypal I should keep it on debug and email.

Does it only send an email if there is an error, or does it send one with every order?

I'm asking as an order came through for a download with the sales amount as $0.00 which I know can happen if you just add to cart and don't select the song or album you want to download.

However I also got a paypal message that has an amount in it, and the word success at the bottom, but I don't know what the message in total means:

2007-02-04 08:03:12
-------------------
(live transaction) --> https://api-3t.paypal.com/nvp
Request Headers: array (
  0 => 'Content-Type: text/namevalue',
  1 => 'X-VPS-Timeout: 45',
  2 => 'X-VPS-VIT-Client-Type: PHP/cURL',
  3 => 'X-VPS-VIT-Integration-Product: PHP::Zen Cart WPP-NVP',
  4 => 'X-VPS-VIT-Integration-Version: 0.1',
)

Request Parameters: {SetExpressCheckout} array (
  'LOCALECODE' => 'US',
  'PAYMENTACTION' => 'Sale',
  'AMT' => '9.99',
  'RETURNURL' =>
'https://www.removed for security/ipn_main_handler.php?type=ec',
  'CANCELURL' =>
'https://www.removed for security/index.php?main_page=login&ec_cancel=1',
  'PAGESTYLE' => 'ourstore_1',
  'METHOD' => 'SetExpressCheckout',
  'CURRENCYCODE' => 'USD',
  'USER' => 'paypal_api1.removed for security,
  'PWD' => '****************',
  'VERSION' => '2.3',
  'SIGNATURE' => '****************************************************oGoj',
)

Response: array (
  'TIMESTAMP' => '2007-02-04T15:03:12Z',
  'CORRELATIONID' => 'f8ccd5781ff3e',
  'ACK' => 'Success',
  'VERSION' => '2.300000',
  'BUILD' => '1.0006',
  'TOKEN' => 'EC-1LF60169EW992892H',
) 

Thank You,
Betty

Give a blonde a new toy, give her the instruction book, and she can't figure out how to get the wrapper off the darn book!

bettysue:

Someone suggested that for Paypal I should keep it on debug and email.This is only needed if you're encountering regular problems with failed transactions.
Does it only send an email if there is an error, or does it send one with every order? It sends several emails for each step of every transaction attempted. This can create a lot of information to try to follow, and most of it is not meaningful unless you understand what to look for.

I ... got a paypal message that has an amount in it, and the word success at the bottom, but I don't know what the message in total means:

Response: array (
'TIMESTAMP' => '2007-02-04T15:03:12Z',
'CORRELATIONID' => 'f8ccd5781ff3e',
'ACK' => 'Success',
'VERSION' => '2.300000',
'BUILD' => '1.0006',
'TOKEN' => 'EC-1LF60169EW992892H',
)
** 'ACK' => 'Success',** means that the particular step of the transaction being reported was successful. This does not necessarily mean you've received payment. It just means that the PayPal server didn't respond with an error at this stage. There are a lot of stages to each transaction.
In the transaction you mention, the "success" message only means that the request to allow the customer to go to the PayPal login page was successful.