I've just recently performed the upgrade. Just tried sending my first mailing tonight. I put together a single email and sent it to the list and received an error to the effect that domail.php could not be found. Closed everything and verified that domail.php exists on the server - it does. I logged back into LM and got the message:
Attention: You have items in the outgoing queue. Some mailings may be in progress.
A progress indicator was there. It never updated and so I hit the resume option. Browser thought for awhile and then gives me a page cannot be found error (trying to access domail.php). When I go "back" the indicator has advanced, as if a batch of messages were sent. I then repeat the process (after waiting 20 mins or so) and again the messages counter advances.
I'm configured for "Internal Sendmail PHP mail" with 500 ms between emails, and 5 mins every 250 emails. What happened to the old progress indicator?
Not sure if any of my emails got sent or not, but I'm cancelling this mailing until I get this sorted out.
Thanks for you help,
R