Test abd Debug SPF with command line How to troubleshoot postfix-policyd-spf-python? Networking Security
Configure OpenDKIM with Postfix on Debian What are opendkim signing criteria? And how Configure OpenDKIM with Postfix on Debian? Our goal is configure OpenDKIM to sign emails for multiple domains. Linux Debian Security Networking
BIND: Disabling IPv6 responses in bind dns server When using Bind9 as DNS service in your own network, it can be helpful to disable IPv6 (AAAA) responses to avoid the client to try to communicate via IPv6 if it hasn't been setup. Debian Linux Networking
BIND DNS server - permission denied How Fix BIND DNS server permission denied problem after log directory or log file change. Bind server failed with error: isc_stdio_open failed: permission denied Debian Linux Networking
DMARC - Domain-based Message Authentication, Reporting and Conformance Domain-based Message Authentication, Reporting, and Conformance, or DMARC, is a technical standard that helps protect email senders and recipients from spam, spoofing, and phishing... Networking Security
Explanation DKIM (DomainKeys Identified Mail) in all details DKIM (DomainKeys Identified Mail) is a system that lets your official mail servers add a signature to headers of outgoing email and identifies your domain’s public key so other mail servers can verify the signature. As with SPF (Sender Policy Framework helps keep your mail from being considered spam. It also lets mail servers detect when your mail has been tampered with in transit. Networking Security
SPF - Sender Policy Framework Sender Policy Framework (SPF) is an email authentication method designed to detect forged sender addresses in emails (email spoofing), a technique often used in phishing and email spam. SPF allows the receiver to check that an email claiming to come from a specific domain comes from an IP address authorized by that domain's administrators. Networking Security
