Hi,
I wonder if opensmtpd starts using new key and certificate chain
automagically,
in case they replaced the old files? Do I have to hup or restart smtpd?
I'm not sure about a new key file[1], but for a renewed certificate
chain[2], renewed for example by acme-client, no restart is necessary.
If used you need to reload httpd and dovecot though! (On OpenBSD:
rcctl reload httpd
rcctl reload dovecot)
[1] pki example.com key "/etc/ssl/example.com_Key.pem"
[2] pki example.com cert "/etc/ssl/example.com_Fullchain.pem"