On Oct 24, 2011, at 10:27 PM, Mikael Abrahamsson wrote: > On Mon, 24 Oct 2011, Dennis Burgess wrote: > >> I am curious about what network operators are doing with outbound SMTP >> traffic. > > Block all TCP/25 and require users to use submit with authentication on > TCP/587. >
If they are using someone else's mail server for outbound, how, exactly do you control whether or not they use AUTH in the process? Further, if you make them use AUTH somehow, but, you don't force TLS, then, you are doing more harm than good IMHO. Owen
