Take note that v1.3.9a, v1.3.9b, v1.3.9c, v1.3.9d, v1.3.9e, v1.3.9f, v1.3.9g, and v1.3.9h have been released since v1.3.8, and contain many important bugfixes and security fixes.
Use PayPal Express Checkout instead. It's much more reliable because the code is much more contemporary.
IPN notification failures, or security validation mismatches.
If the order *does* show up in your store, but emails don't arrive, then it could be a problem with email setup on your site, or blacklisting as you mentioned. But if the orders don't show up either, then it's IPN failure.
Yes.
As I said, this has been working fine. What could cause a failure on an intermittent basis?
All kinds of things: bad hosting, firewalls, busy servers on PayPal's end, and maybe hacker activity on your server.
Many troubleshooting possibilities:
http://www.zen-cart.com/wiki/index.php/PayPal
RECOMMENDED FIX: Two steps:
a) switch to using Express Checkout so that these problems go away immediately (Click "Remove" on the IPN module, and click "Install" on the Express Checkout module. Setup instructions here:
http://www.zen-cart.com/getpaypal . Takes all of 5 minutes, and no change in fees or services. )
b) upgrade to latest version of Zen Cart to benefit from the many bugfixes and security fixes required by your store
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