Guides to improve security.
- php.ini Locations, disable_functions, FPM Pools, and General PHP Information
- How do I use SSL certificates with VSFTPD? Can I use Let's Encrypt too for TLS connections?
- Using Let's Encrypt SSL Certificate for Courier POP3 and IMAP SSL - Download Email Securely into a Gmail Account
- How do I prevent users from changing their domain specific Apache or DNS templates?