- Apple iPhone iPad/ IOS activesync
- MS Outlook POP3/SMTP
- Kerio Connect - Linux Using Let's Encrypt SSL-Zertifikate
- Android / activesync
- E-Mail Versand über Drei Mobil Netz
- MS Outlook / activesync
- Kerio Connect - Windows Using Let's Encrypt
- Kerio Connect - Deploying Let's Encrypt SSL Certificate on Linux DEB Installations
- Exim4 Client mail queue commands
