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---
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title: Virtual domains
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title: SQLite Database
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lastUpdated: 2025-08-14
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slug: ispmail-trixie/virtual-domains
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slug: ispmail-trixie/sqlite
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sidebar:
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order: 150
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order: 155
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---
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import { Aside } from "@astrojs/starlight/components";
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Your mail server will have one fully qualified domain name — for example, `postbox.example.com`. In this case, the base
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domain is `example.com`. If someone visits `https://example.com/`, they might be greeted by the Roundcube webmail login
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page.
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Your mail server must know which domains and email addresses it is responsible for, so it can reject spam sent to
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non-existent users. That information will be put into an SQLite database file that will be located at
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`/var/vmail/ispmail.sqlite`.
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But your server doesn’t have to handle only one domain. You might have users like:
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<Aside title="What is SQLite?">
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SQLite is a lightweight, relational database that stores data in tables with rows and columns, just like bigger
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database systems such as MySQL or PostgreSQL. Unlike those, it doesn’t need a permanently running server process —
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instead, it’s just a library your application uses directly, storing everything in a single file. This makes it easy
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to set up, fast, and ideal for small projects.
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</Aside>
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- `jack@example.com`
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- `lucy@example.com`
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- `tina@example.org`
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- `jeff@example.net`
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These are three different domains, and your server can handle them all.
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This is what _virtual domains_ are for. You give your mail server a list of domains and email addresses and it will
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receive emails for them. Your users will also have passwords that they need to type in to retrieve their emails. You can
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even set up mailing lists that take messages sent to one address and forward them to several users at once.
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To make all this work, we’ll store the configuration in a small SQLite database file. Postfix, Dovecot, and Roundcube
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will all read from this database to know which domains exist, which users they have, and where each email should go. You
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will create that simple database on the next page.
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