We just launched last night, and things are mostly going well, but we're seeing some evidence that users aren't receiving the confirmation e-mail, and a test I've run seems to confirm this. (I'm going to be doing some more digging soon.)
One thing I need to point out is that host limitations(no access to standard mail(), for example) require that we're using the Configure SMTP plugin to route this stuff through the client's GMail apps setup.
One thing that's a bit unclear to me is exactly who sends out the Confirmation Email. Does that get forwarded to Paypal and it gets sent by them, or does the WordPress system send it? And if it's WP, does the plugin try to do this itself, or should it be going through some centralized system in WP so that it would be working through the SMTP plugin's settings? I'm trying to hunt down where the breakage is happening.
Thanks for any help.