Metre is an XMPP Server, but not one that serves XMPP. Instead, it lives inthe nether regions between servers - being a Man In The Middle by design andintent - filtering and securing traffic as required. Metre supports pretty well every bell, whistle, and in fact any other musicalinstrument of XMPP Server to Server security. It then filters traffic, dropsstanzas you don't want, eliding it totally on occasion. It'll throw your traffic over TLS, over DANE, over SATCOM. It'll log it all. It'll protect your autonomous security domain.