Hello,
I'd like to change somehow the config to let authenticated users only
use my OpenSMPTD as a relay. Authentication should be based on the
machine's local user and password table (/etc/passwd).
I tried "listen on ... auth ..." but it complained about the lack of
TLS/smtps.
That is because you can't use authentication without encryption. Best
you start looking into Let’s Encrypt. Though you could start with a
self-signed certificate. Like it is shown in man smtpd.conf
accept from any for ! domain 486.hu relay via
tls+auth://t-onl...@mail.t-online.hu auth <cred>
accept from local for any relay via \
tls+auth://t-onl...@mail.t-online.hu auth <cred>
That should stop the visitors for now.
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