Send a broadcast email to multiple Exchange Server

Hello,

I would like to know if it is possible to create a distribution group on one exchange server running under domain name as example email address removed for privacy reasons, and send a broadcast email to this group and other exchange server distribution groups. Exchange servers running with different domains?

We have multiple companies and sister companies and each company has its own environment, such as DC, Exchange, etc. Our requirement is, we need to send a broadcast email to all companies.

Thanks in advance,

Regards,