Web Reference: Here, we are telling Postfix to both use SASL authentication, and also enable TLS for secure communication. We also provide two paths, one for trusted certificate authorities and one for the login credentials. By default, Postfix has a moderately restrictive approach to mail relaying. Postfix forwards mail only from clients in trusted networks, from clients that have authenticated with SASL, or to domains that are configured as authorized relay destinations. In this post we are going to configure Postfix as a SMTP relay to Mailgun's edge SMTP API (although this will work to any other SMTP endpoint, given the correct credentials) using Simple Authentication Security Layer (SASL) on Ubuntu Linux.
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