Bitnami Roundcube

• Configure Mail Target: /opt/bitnami/roundcube/config/config.inc.php

$config['imap_host'] = 'ssl://mail.domain.com:993';
$config['smtp_host'] = 'tls://mail.domain.com:587';
#Consider to do this!
$config['smtp_auth_type'] = 'PLAIN';

• Letsencryp install (2023)

apt install snapd
snap install core
snap refresh core
snap install --classic certbot
ln -s /snap/bin/certbot /usr/bin/certbot

• Automatic Cert Renewal

systemctl stop bitnami
certonly --domain mail.coolscript.org --renew-by-default  --standalone
cp /etc/letsencrypt/live/mail.domain.org/cert.pem  /opt/bitnami/apache2/conf/bitnami/certs/server.crt
cp /etc/letsencrypt/live/mail.domain.org/privkey.pem  /opt/bitnami/apache2/conf/bitnami/certs/server.key
systemctl start bitnami

• Crontab

shutdown -P +1

Optional Renew the DNS A Record at startup

• /etc/systemd/system/renew-dns.service

[Unit]
Description=Renew DNS Name of mail.domain.org

[Install]
WantedBy=multi-user.target

[Service]
ExecStart=/usr/local/bin/cfddns.pl -c /usr/local/bin/cfddns.xml -v | logger
Type=simple
WorkingDirectory=/usr/local/bin
Restart=on-failure