@minoru I'm aware of the reputation among the big providers. Fortunately, this is not a problem for me, because the domain is quite long-lived, it has the necessary signatures and certificates, and in general hardly more than one hundred emails are sent out on its behalf per year. I need a sender server in extremely specific cases like sending a link to activate a new account or to remind me of my password in my own limited number of users (no more than a dozen) services and for nothing else.