![]() ![]() They simply register their company domain with O365 and create email addresses in that domain and thus bypass default domains.Ĭompanies running hybrid setups, or companies switching to O365 do need this domain to establish co-existence and enable email migrations. ![]() Organisations having standalone O365 tenants don’t use (they could if they wanted to), in fact, they don’t need it. ![]() The purpose of this domain is to facilitate email migrations / co-existence scenarios. Microsoft manages DNS records for this domain and we cannot control that. This domain is fully functional and we can send/receive emails through this domain to/from the internet. Well, when we register an O365 tenant, by default it creates one default domain as ". The question becomes a priority question for companies having a hybrid setup with MX pointing to on-premise custom domains and emails to IDS directly hit to O365 bypassing the on-premise gateway and thus causing a compliance issue. I have clients asking if how we can stop email delivery on (O365 / Exchange online) email addresses since we don’t have any control on this email domain along with DNS entries. ![]()
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