After upgrading to AB 3.5 Pro I noticed the SMTP Email notification stopped working on a task I have been running for a year. I created a new task requesting the email notification. I verified and enabled the SMTP info on the Menu/Settings/Notification area and successfully sent a test email message. When the scheduled backup run there was no email notification sent. The log file indicates everything ran to completion.
I never had a problem with AB 3.2.