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XEP-0184: Message Delivery Receipts #141
XEP-0184, plus XEP-0198 together will make the Message deliver become a very reliable way. From my own opinion, the most important features of a messaging system should do its best to make sure a message being able to be delivered end to end without lost any message. If these two (0184, 0198) being implemented, other missing feature (for example, not be able to always keep-alive for typical web application, will not be an critical defect.) Therefore, XEP-0184, 0198 should be in the higher priority among other enhancements. The earlier converse.js can have these two implemented, the preference of this converse.js will be.
Strophe.js claims to support this: https://github.com/strophe/strophejs-plugins/tree/master/receipts