Certbot wildcard certificates with DNS-01
Issue a wildcard certificate with Certbot using the DNS challenge. How the TXT record proof works, which plugin to install, and how renewal stays automatic.
#dns
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Self-host email with Mailcow on a VPS
Self-host a full mail server with mailcow on a VPS: open port 25, set MX/SPF/DKIM/DMARC/PTR DNS, reach 10/10 on mail-tester, and fix every delivery failure.