Alfresco 5.0.c starts the outbound email subsystem for outbound and then fails to send email. We successfully used version 4.2.c with no problems. This seems to be an issue with 5.0.c. I have attached the latest alfresco.log files and alfresco-global.properties for reference.
I have tried connecting to both the local email server (PostFix) and our Exchange 2013 SP1 server using SMTP with the same results.