Domains Defender

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Domains Defender is a French monitoring service for web agencies, freelancers and online shops. It watches the things that silently break a website or its emails: domain expiry, SSL certificate expiry, DNS record changes, downtime, SPF/DKIM/DMARC misconfiguration, blacklist listings (14 DNSBLs), defacement, new subdomains in Certificate Transparency logs and hijackable subdomains. Urgent issues (confirmed outage, certificate or domain expiring within 7 days, NS/MX change, blacklist listing) trigger an immediate email. Everything else arrives in one daily summary, and nothing is sent when nothing changed. Free plan for one domain. Paid plans from EUR 4.99/month, with Slack, Discord and webhook alerts on Enterprise. Hosted in France, GDPR compliant.