You could post it in the forums, and specify everyone's names (assuming it's not something that must be kept private).
For instance: I can do @myratingis1523 @(insert username here), .... etc. to let all of the users after the "@" sign see this forum post.
How to ISend massive message?
ISend doesn't work on Android-Phones. Get an Apple and you can give it a try
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I could be wrong but I don't think the @ notifies members.
Thing this is what you're asking -
https://www.lifewire.com/text-multiple-people-using-iphone-2000555
Hi everybody,
Do yo know a way to send a message to severals persons?