Does the wildfire server in anyway prioritise messages?
it’'s a xmpp and not a JMS server so where would be the point to prioritize messages? As far as I know xmpp does not allow to set a priority and thus Wildfire does not support this.
There is XEP-0131 but it seems to be a client-side XEP.
XMPP servers don’'t generally have message priority mechanisms, as mentioned by LG. What type of functionality do you have in mind?