Here it is what i want to do, we have four sites, two of them in a country in different cities, and the other two in a different country, right now all sites connected with others via site to site vpns (using ASA cisco devices), each site have its own domain, for instance site A have ABC.com domain site B have XYZ.com domain, and so on. our current exchange design is internal exchange at every site, and each dns have record for the others so any internal user can send mail to internal user at another site and vice versa, what we want to establish now is creating one mail account for user to use inside and outside, my main question for you is, do you think i should set just one mail server for all sites ? or i have to keep four mail servers at four sites and all of them being configured for external access, also what if i want all users have the same domain at there mail boxes like what if i want all employees have mails like [email protected], am i should let this mail server join one of domains or not? please try to help me out to set a good design, thanks.
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