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| <article class="doc"> |
| <h1 class="page">Storage</h1> |
| <div class="sect1"> |
| <h2 id="_overview"><a class="anchor" href="#_overview"></a>Overview</h2> |
| <div class="sectionbody"> |
| <div class="paragraph"> |
| <p>Email is useful because any one person can send a message to any other person, |
| anywhere in the world. The heart of email is the ability to transfer some message |
| based on a commonly-understood message format between two different systems that |
| may have been developed entirely independently of each other. The concept is relatively |
| simple, but the fact that email is so ubiquitous is simply a miracle.</p> |
| </div> |
| <div class="paragraph"> |
| <p>However, there is more to email than just the transfer of messages.</p> |
| </div> |
| <div class="paragraph"> |
| <p>For starters, I want people I know to be able to send me a mail even when |
| I happen to be out mountain climbing. I want to be able to receive the message |
| when I’m not available, then review it afterward when I am back at my desk. |
| For this reason, email is by design asynchronous. Time can pass between the moment |
| a mail is sent and the moment it is read. |
| In the meantime, it needs to be stored somewhere.</p> |
| </div> |
| <div class="paragraph"> |
| <p>Additionally, although it is possible to read a message, then discard it, never to be seen again, |
| it is more common for people to archive a message. Some people even get creative and |
| use their email for various other purposes, such as a kind of poor man’s information archive. |
| Many corporations use email for business purposes, which requires administration of |
| users within the organization. |
| Even individuals with a self-hosted email server want to ensure that their system does |
| not get abused as an <a href="../glossary.html#open_relay" class="page">open relay</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>All of these types of concerns requires that the system maintain some kind of state, |
| whether that be the messages themselves, information about the system’s users, |
| and even in some cases user credentials. Keeping state requires a storage system. |
| The system of storage must work intimately with the various |
| <a href="../protocols/index.html" class="page">protocols</a>.</p> |
| </div> |
| <div class="paragraph"> |
| <p>In this section, we describe the two principle types of storage that James manages:</p> |
| </div> |
| <div class="ulist"> |
| <ul> |
| <li> |
| <p><a href="mailbox.html" class="page">Mailboxes</a> for email storage, and</p> |
| </li> |
| <li> |
| <p><a href="users.html" class="page">User Repository</a> for data about Mailbox users.</p> |
| </li> |
| </ul> |
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