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Within Internet message handling services (MHS), a message transfer agent or mail transfer agent (MTA) or mail relay is software that transfers electronic mail messages from one computer to another using a client–server application architecture. A MTA implements both the client (sending) and server (receiving) portions of the Simple Mail Transfer Protocol (SMTP). The terms mail server, mail exchanger, and MX host may also refer to a computer performing the MTA function. The Domain Name System (DNS) associates a mail server to a domain with mail exchanger (MX) resource records containing the domain name of a host providing MTA services.
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On new exchange server versions (and Office365 is based on Exchange 2016) the server name is not required any longer to establish connections. If you want to use any client service you point to service names such as:
- outlook.office365.com (For web access, imap, pop)
- smtp.office365.com (For smtp services)