Internal message for all users

Hello everybody,

Is there any plugin to send internal message from admin to all users that is working perfectly for a production site in elgg 1.8.x? I tried several but none worked correctly. Apparently sends a message however users get nothing. I used: AdminShout for Elgg 1.8, Mass Mailout, Mass Mailout (improved), HTML email handler for Elgg 1.8 among others.

Any idea or suggestion?

Best regards,