E-Mail Notifications No Longer Work after Service Pack 1

Hello! I have written this message to your support.opmanager.com site already, but I haven't gotten any response back yet, not even a 'we'll look into it' message, so I thought I'd try it here.

I applied Service Pack 1 to my Opmanager 6 a week or so ago. Everything seemed to be running ok but then I noticed that I wasn't receiving any E-Mail Alarm notifications any longer. I checked the E-mail settings, everything looks ok, and the test even works. So I tried creating a new Notification Profile and assigned it to a device, still nothing.

Please help! I have already sent you a Support Information File, please reference Request ID : 77597

Here is an excerpt from the log:

01:18:15:451 Notifications: Sending Email Notification for 10.0.10.78 through null at port null
01:18:16:558 Notifications: Exception while sending message at:
javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 25;
nested exception is:
java.net.ConnectException: Connection refused: connect
at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1008)
at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:197)
at javax.mail.Service.connect(Service.java:233)
at javax.mail.Service.connect(Service.java:134)
at com.adventnet.nms.smtp.SmtpMailer.sendMessage(SmtpMailer.java:320)
at com.adventnet.nms.eventdb.SendEmail.runAction(SendEmail.java:475)
at com.adventnet.me.opmanager.server.NotificationThread.notify(NotificationThread.java:436)
at com.adventnet.me.opmanager.server.NotificationThread.checkAndNotify(NotificationThread.java:387)
at com.adventnet.me.opmanager.server.NotificationThread.run(NotificationThread.java:151)
01:18:16:558 Notifications: Exception occured while executing Send Email action. Please verify the settings for the same:java.lang.ClassCastException: java.net.ConnectException