Shared SMTP domain between 2 hybrid Exchange environments

31 Mar

Initial situation

A shared SMTP domain between two hybrid Exchange environments, where no mailboxes are in the Office 365 tenant part.

The shared SMTP domain is @bigCompany.com

Company A mail-enabled objects (users and groups) has an addional smtp address @companyA.com

Company B mail-enabled objects (users and groups) has an addional smtp address @companyB.com Continue reading