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| <article class="doc"> |
| <h1 class="page">Apache James Core Concepts</h1> |
| <div id="preamble"> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>The core domain of Apache James is intimately related to email communications. |
| Therefore this section is divided into topics that deal with the various |
| aspect of email systems.</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="#emails">Email Messages</a></p> |
| </li> |
| <li> |
| <p><a href="#protocols">Transmission Protocols</a></p> |
| </li> |
| <li> |
| <p><a href="#mailbox">Mailbox and Email Storage</a></p> |
| </li> |
| <li> |
| <p><a href="#processing">Email Processing</a></p> |
| </li> |
| </ul> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="emails"><a class="anchor" href="#emails"></a>Email Messages</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Electronic Mail (often written as "e-mail" or "email") is a means of |
| exchanging messages over a data network. In our context, it is obvious |
| that we mean "electronic mail" and not "postal mail", so we usually just |
| write "mail".</p> |
| </div> |
| <div class="paragraph"> |
| <p><a href="mail/index.html" class="page">Email messages</a> are based on a few specifications |
| that are not easy to digest, so we make an effort to provide a simplified |
| model.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="protocols"><a class="anchor" href="#protocols"></a>Transmission Protocols</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Emails are only useful because people can communicate with each other. |
| To allow for this, obviously there must be a means of transmitting messages |
| from one user to another. A number of different protocols have emerged to |
| handle the various different requirements of using email in a practical |
| manner. The most common <a href="protocols/index.html" class="page">transmission protocols</a> |
| are SMTP, POP, and IMAP. More recently JMAP is an interesting protocol |
| that merits attention.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="mailbox"><a class="anchor" href="#mailbox"></a>Mailbox and Email Storage</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Email would not be very useful if, like in <a href="https://www.youtube.com/watch?v=0TiqXFssKMY">Mission Impossible</a>, |
| a message would self-destruct immediately after being read. |
| For those of us who are not secret agents, we generally prefer to keep |
| a record of those messages that we receive. For this reason we need a means |
| of <a href="storage/index.html" class="page">storing messages</a>.</p> |
| </div> |
| </div> |
| </div> |
| <div class="sect1"> |
| <h2 id="processing"><a class="anchor" href="#processing"></a>Email Processing</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>There are many ways to peel a potato. James has its own particular |
| <a href="processing/index.html" class="page">model for processing mail</a>, |
| based mostly on the concept of a "Mailet". The idea of Mailet-based |
| processing was heavily inspired by the <a href="https://en.wikipedia.org/wiki/Java_servlet">Servlet</a> |
| concept.</p> |
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