cosmetic: add contact. change "email address" to "Jabber ID"
In v10 rc1 I am prompted for an email address to invite. Not every JID functions as an email address. (In an ideal world it would be xmpp, email, and sip).
#4 Updated by hans almost 4 years ago
This is definitely a complicated question. For many services, the email address and jabber ID are the same, but probably most do not have this setup. The most XMPP users are probably using gmail.com, so many if not users are used to thinking of it as an email address.