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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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Please refer following article:
https://www.123marbella.co.uk/clients/knowledgebase.php?action=displayarticle&id=51
http://kb.site5.com/email/email-software/ios/how-to-sync-sent-drafts-deleted-ios/