We've recently deployed SharePoint 2013 on Windows 2012 R2 Environment.
I want to setup SMTP server for outbound email so that user's can setup Alerts on the SharePoint portal. I've managed to install the SMTP server on one of the WFE in the DMZ (We have 2 external WFE in the DMZ installed on hyper-v). Anyways, I need to know how to configure
a) SMTP server
b) What needs to be added to the Internal DNS
c) Entries need for the external DNS