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
What is email envelope and email header The key for understand smtp protocol is learn, what is difference between email envelope and email header. Another words, what is email envelope vs email header. Networking Security
Test IMAP with telnet You may wish to test IMAP commands against the IMAP service. This article decribes how this can be done. This example has been tested with debian stable distro, but should work same or similar with any Linux or Windows machine. Networking Linux
Arpwatch - monitor mac addresses change Arpwatch is a computer software open source program. It monitors the ARP activity over the network and detects ARP spoofing. It also maintains the database of Ethernet/IP address pairings. Arpwatch gives a list of noticed pairing IP and MAC addresses. Techniques to monitor Ethernet Activity using Arpwatch Tool in Linux is illustrated in this tutorial with examples. Networking Linux Security
OCSP Stapling on Nginx and Apache webserver To understand OCSP stapling, it is necessary to understand OCSP, the Online Certificate Status Protocol. OCSP is a protocol for determining whether a certificate is revoked (for instance, becau se its private key was compromised). Every time a browser connects to an HTTPS website, it contacts the OCSP responder specified in the SSL certificate, and asks if the certificate is revoked. If the respond er replies that the certificate is revoked, the browser blocks the page from loading. Web Servers Networking Security
ProFTPd Server with virtual users and in SFTP mode How to configure proftpd server with virtual users and with sftp mode. Debian Linux Networking Security
Rewrite uri to lowercase in nginx and apache webserver Force URLs to lowercase - Learn how to convert URLs to lowercase... Debian Linux Networking Web Servers
