I've got a Windows Server 2008 R2 machine (VM actually, 2x2.66GHz Nehalem vCPUs, 4GB RAM) that needs to relay about a million emails per day (busy website sending out lots of notifications). Bandwidth ...
I'm having to move an SMTP server from a Linux VM using postfix to a Windows 2012 R2 server. So I installed the standard IIS 6 SMTP service in Windows 2012 R2. Everything seems to be working fine ...