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In reality, the terms '''MTA''', '''MDA''', '''MUA''', '''LDA''' can actually be considered misleading since some of those services can be incorporate combined together for certain applicationsto form a single entity (application), while others can other applications may operate as separate entities. are not 100% well defined, because few of the related services are simple and do exactly one thing. There is may be overlap, so if you don't find the those acronyms helpful - , don't worry too much about them. But On the other hand, when referred to in diagrams, they can help organize your thoughts to visualize those processes when trying try to keep all this in your headunderstand how an e-mail system works.

[http://wiki.dovecot.org/MailServerOverview Here's an overview] of those terms (from the Dovecot wiki, it's ). It is worth readingviewing this link.