jabber.cc supports server-to-server encryption. but this is only of use if the receiving server does support it, too. the following servers support server-to-server encryption:

• aim.gate.amessage.de
• aim.jabber.ccc.de
• aim.jabber.org.uk
• aim.jabberpl.org
• aim.jabjab.de
• amessage.at
• amessage.be
• amessage.ch
• amessage.de
• amessage.dk
• amessage.info
• amessage.nl
• aspsms.swissjabber.ch
• bishops.org.za
• butterfat.net
• chat.amessage.info
• chrome.pl
• cmeerw.net
• conference.butterfat.net
• conference.jabber.ccc.de
• conference.jabber.ru
• conference.swissjabber.ch
• craponne.org
• devrieze.dyndns.org
• elitesecurity.org
• eniac.de
• gg.jabber.autocom.pl
• gg.jabber.ccc.de
• gg.jabberpl.org
• headlines.jabber.autocom.pl
• icq.amessage.info
• icq.jabber.autocom.pl
• icq.jabber.ccc.de
• icq.jabber.org.uk
• icq.jabberpl.org
• icq.jabjab.de
• icq.swissjabber.ch
• im.gloport.net
• irc.jabber.org.uk
• isar.eniac.de
• jabber.autocom.pl
• jabber.ccc.de
• jabber.com
• jabber.org.au
• jabber.ru
• jabber.unoc.net
• jabber2.curitiba.pr.gov.br
• jabberpl.org
• jabjab.de
• jud.jabber.ccc.de
• jud.jabber.ru
• ludzie.jabberpl.org
• msn.dev.jabber.org.uk
• msn.jabber.ccc.de
• msn.jabber.org.uk
• msn.jabber.ru
• msn.jabjab.de
• neosmt.com
• proxy65.jabber.autocom.pl
• proxy65.jabber.ccc.de
• pubsub.jabber.ccc.de
• rooms.jabber.org.au
• rss.jabber.ccc.de
• rss.jabber.ru
• rss.jabberpl.org
• smsy.jabber.autocom.pl
• spaceboyz.net
• swissjabber.ch
• swissjabber.de
• swissjabber.li
• swissjabber.org
• syndicon.de
• thetofu.com
• tlen.jabberpl.org
• webkeks.org
• xmpp.org
• yahoo.amessage.info
• yahoo.dev.jabber.org.uk
• yahoo.jabber.ccc.de
• yahoo.jabber.org.uk
• yahoo.jabber.ru
• yahoo.jabberpl.org
• yahoo.swissjabber.ch

this is generally a good thing. however, there are still many more servers out there which know nothing about server-to-server encryption! if you know people with accounts on a server not listed here, you might consider asking them to urge their jabber admin to update their server software to a version capable of server-to-server encryption, as this will help to secure your communication, which should be in everyone's interest.