I want Postfix to proxy SMTP connections from MUA on my client to another outer SMTP server.
Since the outer SMTP server requires the Postfix proxy to authenticate with SMTP-AUTH, So I set my MUA's credentials into the proxy in
/etc/postfix/sasl_passwd and configure
smtp_sasl_auth_enbale = yes and
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd in
postmap /etc/postfix/sasl_passwd and
systemd restart postfix, I can send a mail and safely receive via the proxy.
But from the point of my client, it is not natural that the credentials are placed on the proxy server.
So please tell me how I can pass through the credentials themselves without saving them on the proxy.
The Postfix proxy is run on Ubuntu 15.04.
Can anyone be of help?