I am using spamcop and spamhaus to block. There are indeed outlook.com ip addresses that bounce.
> > Does anyone else just block all traffic from *.onmicrosoft.com? I have > literally NEVER gotten anything from that domain which is not obvious junk. > > I set up postfix to just flat out refuse anything from that domain.[1] > If I get any complaints, I may ease it up, but I was getting TONS of > spam messages from that domain and I figured it was easiest to just > block it. >
