I need some kind of SMTP proxy server which does not verify passwords and directly pass credentials and data to a target server. The target server uses self-signed certificate so I want use my own certificate.
It would be nice if the proxy could also connect to open SMTP server from ISP with credentials removed.
There are email clients in a network which use same SMTP server with self a signed certificate. Once this server was blacklisted so clients could not send emails. I want some proxy which I can use to direct traffic to the final server and in case of blacklisting I could change target on one place to alternative open SMTP from ISP.
So I want use my certificate for clients to avoid setting the self-signed certificate as trusted every year but still accept this certificate.
I have tried postfix but I was not able to set it transparent. It tries to retry in case of error instead of report it to client.