I have a 5.1 MM with 2 MAS Servers and 1 MSS. We don't backend our system with Exchange and use SMTP mail to deliver email notification of the VM. We typically see a 3-5 minutes turn around from the time a message is left to the actual time the email is delivered to the user. Some messages, for whatever reason take a bit longer. Is there a way to improve/shorten this time frame in the system ?