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→Learning About the Services Involved in an Email Delivery
In reality, the terms '''MTA''', '''MDA''', '''MUA''', '''LDA''' can actually be considered misleading since some of those services can be combined together to form a single entity (application), while other applications may operate as separate entities. There may be overlap, so if you don't find those acronyms helpful, don't worry too much about them. On the other hand, when referred to in diagrams, they can help to visualize those processes when trying to understand how an e-mail system works.
[http://wiki.dovecot.org/MailServerOverview Here's is an overview] of those terms (from the Dovecot wiki). It is worth viewing this link.
In the diagram displayed above, the elements include:
