Reassign multiple service frontends from 81xx to 80xx ports (Forgejo,
ntopng, AdGuard, Scrutiny, Paperless, Whats Up Docker, etc.) and update
homepage links.
Configure ACME (webroot) and add certs for kempinger.at,
webadmin.kempinger.at,
and bilder.kempinger.at; update nginx virtual hosts to use ACME hosts
and
serve the ACME challenge path.
Add users stalwart-mail and nginx to the acme group and open
SMTP-related
firewall ports (25, 587) plus mail UI ports (8090, 8091).
Add and configure the Stalwart mail service (SMTP, submissions, IMAP,
JMAP)
and adjust related service ports/settings (ntopng, scrutiny, influxdb,
WUD).
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