This application checks a DANE TLS Service. It connects to the specified
TLS service and then attempts to authenticate its TLS server certificate
according to its corresponding DANE TLSA records in the DNS.
XMPP C2S (xmpp-client)
XMPP S2S (xmpp-server)
(Optional) If the application service name is different than the server's hostname:
Perform name checks for DANE-EE mode TLSA records (default is don't)
Allow invalid SMTP usage modes 0, and 1 (default is don't)