Openfire to Spark Broadcast issue

Hello,
I am hoping someone can help with this issue. I am running Openfire.server 4.1.3 and Spark 2.8.3. When sending Broadcast message my off line users are not getting the message when they log in. Is there some setting or something I should be looking at to correct this?
Thank you

How do you send it? If you use Message tool on the Sessions page in Admin Console, then it only sends to connected, online users. If you are using Broadcast plugin, there is a setting in its readme, that enables sending to offline users. You can also use Spark for broadcasting and select offline users along with online ones.

Thank you for your reply. I use the Broadcast plugin. now exactly where is this setting?

http://www.igniterealtime.org/projects/openfire/plugins/broadcast/readme.html

plugin.broadcast.all2offline

you have to add it as a system property via Admin Console.