Notifications are turned off. On March 1st forwarded emails will start to bounce: remember to stop sending them!
Just submitted PM 2.6 with boolean pattern expressions, a repeat option for notifications, built-in mail composer and web browser.
PushMail 3.0 has been approved: check the App Store in a few hours for attachment support (enable it in your profiles) and 50 new sounds!
Just tested PushMail on iOS 6: seems to work OK. Let me know if you find huge regressions, I might publish an update if it is worth it.
PushMail 3.0: attachments support, 50 new sounds, submitted next week.