Security
nftables and GeoIP
How nftables log to external file
OCSP Stapling on Nginx and Apache webserver
Explanation DMARC (Domain-based Message Authentication, Reporting and Conformance) in all details
Explanation SPF (Sender Policy Framework) in all details
Explanation DKIM (DomainKeys Identified Mail) in all details
What is email envelope and email header
Add or Change SSL/TLS certificate in Lotus Domino
ProFTPd Server with virtual users and in SFTP mode
Working with Vsftpd as FTPS server with virtual users and SSL certificates in Debian or Ubuntu
