telnet exchange.krypted.com 25Which shows the following:
220 exchange.krypted.comThen we say hi:
HeloAnd because the laws of robotics tell it to do so, the server says hi back:
250 exchange.krypted.com HelloThen we try and relay to it:
mail from:email@example.comAnd we get this error at some point in our smtp communication:
530 5.7.1 Client was not authenticatedNow, at this point we should look at the receive connector for Exchange, part of Hub Transport. To do so, open Exchange System Manager or Exchange Management Console and select Hub Transport under the Server Configuration section. Here, locate your default receive connector (don’t do this on a send connector or you will create an open relay), right click it and then click on Properties. At the Properties dialog, check the box for Anonymous users. This allows for another mail server to communicate with yours over smtp since that other server is basically just running through the message dialog we worked through earlier while telneted into the host. Click Apply to save the changes and for giggles go ahead and stop (disable) and start (enable) the connector.
krypted October 9th, 2013