Hi @javed faruquee 

As far as I can tell, I don’t think we have this option available yet -to be able to send the same message to all boards. Apologies for that. If this is a feature you’d like to see added, you can add submit it as a Wish List item with descriptions of the use case so that our team can scope it out. 

In the meantime, just in case it is helpful, here is an article on the Attention Management options in Miro.