> Date: Sunday, April 19, 2020 13:47:32 -0600 > From: "S.Bob" <sbob at quadratum-braccas.com> > > my relay will be smtp.fastmail.com and it requires authentication > and SSL, are there added settings in main.cf that will allow this? What port is that delivering to -- that doesn't sound like port 25, which is the default that an MTA delivers to. The postfix list may be a better place to ask these configuration questions. The general expectation there is that one has spent time going through the documentation.