Email confirmation not sending after successful payment made at PayPal - WP

[tkdavey]

Hi there, we're currently running the latest version of civiCRM 4.5.0 WordPress.

We provide two different payment options with our membership signup through civiCRM - online payment via PayPal Standard option, and the "Pay Later" option.

What we're experiencing, and have experienced with previous versions of civiCRM is that with the online payment option, after a new registration transaction has been completed at the PayPal end, when the IPN comes back it doesn't seem to be triggering the confirmation email function which sends a confirmation email to the new registrant. Everything else works fine, the membership is updated with contribution details, and the membership status is updated to "New". Have checked the civiCRM logs and this process is being logged with no apparent errors, but the confirmation mail for online payments isn't working. And from recall it hasn't worked for the online payments option. The "Pay Later" option sends the confirmation emails just fine, so we think it has something to do with either the IPN itself or a bug somewhere in the code that handles the IPN.

Hopefully someone can help. I've scoured the forum and there seems to be a number of users who are experiencing this in one way or another, most with the civiEvents function, however I haven't yet come across a conclusive solution - and unfortunately some threads on this topic become hi-jacked with someone who usually has an issue that isn't really related.

If you have no solutions, could someone kindly point me to the place in the code which handles this email confirmation process, so I can take a look at it.

Thanks,