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Monthly Archives: March 2017
Permanently reject a specific email sender address using postfix
Postfix generally accepts all sender addresses. It might be needed in some rare cases to reject one sender addresses for some reason. With postfix, there is the possibility to use the “check_sender_access” to set individual actions per sender address. For the … Continue reading
Posted in Linux Administration, Mailserver
Tagged check_sender_access, email, postfix, recipient_restrictions, reject, sender address, sender_access
Comments Off on Permanently reject a specific email sender address using postfix
Certificate Transparency and unauthorized certificates
I own a domain which was bought a few months back which is managed by CloudFlare’s service in DNS-only mode. As I intended to only use CloudFlare’s DNS service, I disabled every option except the DNS related features. You can imagin the surprise to see certificates issued for my domain without my knowledge. Continue reading
Posted in Security, Web technologies
Tagged certificate, Certificate Transparency, Cloudflare, Comodo, CT, DNS
1 Comment