In case you didn’t know, OpenSMTPd is so outdated on Ubuntu systems, that you’ll need to install it from sources, otherwise expect some TLS issues 🙂

You will need to use the following:

./configure \
 --with-user-smtpd=opensmtpd \
 --with-user-queue=opensmtpq \
 --with-group-queue=opensmtpq

mkdir -p /var/empty

ln -s /etc/ssl/certs/ca-certificates.crt /usr/lib/ssl/cert.pem

Congrats, now you have a proper working SMTP server.

Cheers.

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