The HTML Control Panel ist not showing outgoing emails

Relaying (for outgoing emails) completes the activation phase.

The prerequisite for this is that the external IP address has been entered in the Control Panel.

See: Control Panel Manual

This additional service, which is already automatically integrated, allows the full range of email services to be used. During relaying, outgoing messages are checked for viruses or content policies and then transmitted to the recipient.

Hornetsecurity uses a hostname-cluster with various connected load balancers for relaying: 

relay-cluster-eu01.hornetsecurity.com 

My company uses a whitelabled control panel with its own URL.

If your company uses the Whitelable Service for your control panel, please set the following entry instead

domain.tld.relay.cloud-security.net
(e.g. gevonne.de.relay.cloud-security.net)

domain.tld should be replaced with the domain you use to access the control panel.