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I'm getting an hourly email from /etc/cron.hourly/sympl-mail-dovecot-sni saying:

doveconf: Warning: please set ssl_dh=</etc/dovecot/dh.pem doveconf: Warning: You can generate it with: dd if=/var/lib/dovecot/ssl-parameters.dat bs=1 skip=88 | openssl dhparam -inform der > /etc/dovecot/dh.pem

It looks like from https://wiki2.dovecot.org/Upgrading/2.3#dhparams you can do just that in order to fix the issue, but not sure if there's something else that should be done instead/as well. I'm running the buster version of Sympl.