Postfix uses the relay host configuration directive to send emails to external domains. The directive must contain the hostname orIP addressof the remote SMTP server or SMTP service you want to use. For example, use SendGrid, Mandrill, Mailgun, or any other external SMTP provider. Important:T...
This tutorial showed how to install and configure the SMTP server on Windows Server operating systems. An SMTP server allows you to exchange emails using the MTA, making it a great solution when you want to set up your own mail server. Next, learn how toset up Postfix to use an external...
An SMTP error code “550 5.7.54, Unable to relay recipient in non-accepted domain” is received instead. The receive connector will not allow an anonymous, unauthenticated sender to relay to external domain names, which prevents your server from being exploited as an open relay. There are two...