mail-svelte Svelte Themes

Mail Svelte

Write email using svelte components

#email #email-te #svelte #svelte5
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Svelte Mail (WIP)

A powerful email template builder for Svelte applications, inspired by React Email.

Installation

pnpm add mail-svelte
# or
npm install mail-svelte
# or
yarn add mail-svelte

Basic Usage

Here's a basic example of how to create an email template:

<script lang="ts">
    import { Html, Head, Body, Container, Section, Text } from 'mail-svelte';
</script>

<Html>
    <Head>
        <title>Welcome Email</title>
    </Head>
    <Body>
        <Container>
            <Section>
                <Text>Hello from Svelte Mail!</Text>
            </Section>
        </Container>
    </Body>
</Html>

Components

1. Html Component

The root component for your email template.

<Html lang="en" dir="ltr">
    <!-- Your email content -->
</Html>

Props:

  • lang: Language code (default: "en")
  • dir: Text direction (default: "ltr")

2. Head Component

Contains metadata and styles for your email.

<script lang="ts">
    import { Head, Font } from 'mail-svelte';
</script>

<Head>
    <title>Email Title</title>
    <Font fontFamily="Arial" fallbackFontFamily={['Helvetica', 'sans-serif']} />
</Head>

The Head component automatically includes:

  • UTF-8 charset meta tag
  • Apple email client formatting meta tag

3. Font Component

Add custom fonts to your email. Can be used in two ways:

  1. Web Font:

    <script lang="ts">
    import { Font } from 'mail-svelte';
</script>

<Font
    fontFamily="Roboto"
    fallbackFontFamily={['Helvetica', 'sans-serif']}
    webFont={{
        url: 'https://fonts.googleapis.com/css2?family=Roboto',
        format: 'woff2'
    }}
/>

  2. System Font:

    <script lang="ts">
    import { Font } from 'mail-svelte';
</script>

<Font fontFamily="Arial" fallbackFontFamily="sans-serif" />

Props:

  • fontFamily: Primary font name (required)
  • fallbackFontFamily: String or array of fallback fonts (optional, defaults to 'sans-serif')
  • webFont: Optional web font configuration object ({ url: string, format: string }). If provided, an @font-face rule will be generated.
  • fontStyle: Font style (optional, default: 'normal')
  • fontWeight: Font weight (optional, default: 400)

4. Body Component

Container for your email content.

<script lang="ts">
    import { Body } from 'mail-svelte';
</script>

<Body style="background-color: #f6f9fc;">
    <!-- Email content -->
</Body>

5. Container Component

A centered wrapper with a maximum width.

<script lang="ts">
    import { Container } from 'mail-svelte';
</script>

<Container style="max-width: 600px;">
    <!-- Contained content -->
</Container>

6. Section Component

A structural component for grouping content.

<script lang="ts">
    import { Section } from 'mail-svelte';
</script>

<Section style="padding: 20px 0;">
    <!-- Section content -->
</Section>

7. Row & Column Components

Create responsive layouts.

<script lang="ts">
    import { Row, Column, Text } from 'mail-svelte';
</script>

<Row>
    <Column style="padding: 10px;">
        <Text>Column 1</Text>
    </Column>
    <Column style="padding: 10px;">
        <Text>Column 2</Text>
    </Column>
</Row>

8. Button Component

Create email-client compatible buttons.

<script lang="ts">
    import { Button } from 'mail-svelte';
</script>

<Button href="https://example.com" style="background-color: #000; color: #fff;" padding="12px 20px">
    Click me
</Button>

Padding Props

  • padding: Shorthand for all sides. Accepts CSS units: px, em, rem, %, or number (pixels).
  • paddingTop, paddingRight, paddingBottom, paddingLeft: Individual paddings. Accepts same units as above. These override the corresponding value from padding if both are provided.

Examples:

<!-- Shorthand padding (all sides) -->
<Button padding="16px">All sides 16px</Button>

<!-- Vertical | Horizontal -->
<Button padding="10px 24px">10px top/bottom, 24px left/right</Button>

<!-- Top | Horizontal | Bottom -->
<Button padding="8px 20px 12px">8px top, 20px left/right, 12px bottom</Button>

<!-- Top | Right | Bottom | Left -->
<Button padding="8px 16px 12px 24px">8px top, 16px right, 12px bottom, 24px left</Button>

<!-- Mixed units -->
<Button padding="1em 10%">1em top/bottom, 10% left/right</Button>

<!-- Individual overrides -->
<Button padding="12px" paddingLeft="32px">12px all, but 32px left</Button>

<!-- All individual -->
<Button paddingTop="10px" paddingRight="20px" paddingBottom="10px" paddingLeft="20px">
    Explicit sides
</Button>

MSO/Outlook Compatibility

  • The Button component uses special hacks to simulate padding in Microsoft Outlook (MSO) using invisible elements and mso-font-width.
  • All padding values are converted to pixels for email compatibility, including em, rem, and % (relative to 600px width).

Other Props

  • href: Button link URL (required)
  • target: Link target (default: "_blank")
  • style: Inline styles (string or object)
  • class: CSS class
  • Any other anchor (<a>) attributes

Advanced Example

<Button
    href="https://example.com"
    style="background: #0070f3; color: #fff; border-radius: 6px;"
    padding="1em 2em"
    paddingLeft="40px"
    target="_self"
    class="my-button"
    aria-label="Special Button"
>
    Advanced Button
</Button>

9. Text Component

Renders text content with sensible defaults.

<script lang="ts">
    import { Text } from 'mail-svelte';
</script>

<Text style="color: #333; font-size: 16px;" as="span">Your text content</Text>

Props:

  • as: HTML element to render (default: "p")
  • style: Inline styles (string).
  • Any other HTML attributes for the element specified by as.

Default styles (merged with the provided style prop):

  • font-size: 14px
  • line-height: 24px
  • margin: 16px 0

Create styled links.

<script lang="ts">
    import { Link } from 'mail-svelte';
</script>

<Link href="https://example.com" style="color: #067df7;">Click here</Link>

Props:

  • href: Required URL
  • target: Link target (default: "_blank")
  • Default styles:
    • color: "#067df7"
    • textDecorationLine: "none"

11. Image Component (Img)

Add images with proper email client support.

<script lang="ts">
    import { Img } from 'mail-svelte';
</script>

<Img
    src="https://example.com/image.jpg"
    alt="Description"
    width="600"
    height="400"
    style="border-radius: 4px;"
/>

Props:

  • src: Image URL
  • alt: Alt text
  • width: Image width
  • height: Image height
  • Default styles:
    • display: "block"
    • outline: "none"
    • border: "none"
    • textDecoration: "none"

Note on Centering: Because the Img component defaults to display: block;, using text-align: center; on a parent element (like <Column>) will not center the image. To center an image, apply margin: 0 auto; directly to the Img component's style prop:

<Img src="..." alt="..." width="100" style="margin: 0 auto;" />

Note on Right Alignment: If you want to right-align a block-level element (such as a button or a link with display: block) inside a Column, setting text-align: right; on the parent will not work. Instead, add margin-left: auto; margin-right: 0; to the element's style prop:

<script lang="ts">
    import { Link } from 'mail-svelte';
</script>

<Link href="#" style="display: block; width: 220px; margin-left: auto; margin-right: 0;">
    Track Package
</Link>

12. Hr Component

Add horizontal rules.

<script lang="ts">
    import { Hr } from 'mail-svelte';
</script>

<Hr style="border-color: #e6e6e6;" />

Default styles:

  • width: "100%"
  • border: "none"
  • borderTop: "1px solid #eaeaea"

13. Heading Component

Create headings with proper styling.

<script lang="ts">
    import { Heading } from 'mail-svelte';
</script>

<Heading as="h1" style="font-size: 24px;" m="0" mb="20px">Your Heading</Heading>

Props:

  • as: Heading level (h1-h6)
  • Margin props: m, mx, my, mt, mr, mb, ml

14. Preview Component

Adds preview text (preheader) to your email, which appears in the inbox list view of most email clients.

<script lang="ts">
    import { Preview } from 'mail-svelte';
</script>

<Preview text="This text appears in the inbox preview, but not the email body." />

Props:

  • text: The preview text string (required).
  • style: Optional inline styles (string or object) for the hidden div element.

Details:

  • The component renders the provided text inside a hidden div.
  • The text is truncated to a maximum of 150 characters (PREVIEW_MAX_LENGTH).
  • To prevent email clients from showing subsequent email body content in the preview, the component automatically appends invisible whitespace characters (like &nbsp;, &zwnj;, etc.) to fill the remaining space up to the 150-character limit.

Complete Example

Here's a complete example of a welcome email:

<script lang="ts">
    import {
        Html,
        Head,
        Font,
        Preview,
        Body,
        Container,
        Section,
        Row,
        Column,
        Heading,
        Text,
        Button,
        Img,
        Hr,
        Link
    } from 'mail-svelte';
</script>

<Html>
    <Head>
        <title>Welcome to Our Service</title>
        <Font
            fontFamily="Roboto"
            fallbackFontFamily={['Helvetica', 'Arial', 'sans-serif']}
            webFont={{
                url: 'https://fonts.googleapis.com/css2?family=Roboto',
                format: 'woff2'
            }}
        />
    </Head>
    <Preview>Welcome to our platform! We're excited to have you on board.</Preview>
    <Body style="background-color: #f6f9fc; font-family: 'Roboto', Helvetica, Arial, sans-serif;">
        <Container style="max-width: 600px; margin: 0 auto; padding: 20px 0;">
            <Section style="background-color: #ffffff; padding: 40px; border-radius: 4px;">
                <Img
                    src="https://example.com/logo.png"
                    alt="Company Logo"
                    width="150"
                    height="50"
                    style="margin-bottom: 30px;"
                />
                <Heading as="h1" style="color: #1a1a1a; font-size: 24px;" mb="20px">
                    Welcome aboard!
                </Heading>
                <Text style="color: #4a4a4a; font-size: 16px; line-height: 1.5;" mb="20px">
                    We're thrilled to have you as a new member of our community.
                </Text>
                <Button
                    href="https://example.com/get-started"
                    style="background-color: #0070f3; color: #ffffff; border-radius: 4px;"
                    padding="12px 32px"
                >
                    Get Started
                </Button>
                <Hr style="margin: 30px 0;" />
                <Row>
                    <Column style="padding: 10px;">
                        <Text style="color: #666666; font-size: 14px;">
                            Need help? <Link href="https://example.com/support">Contact Support</Link>
                        </Text>
                    </Column>
                </Row>
            </Section>
        </Container>
    </Body>
</Html>

Best Practices

  1. Always include fallback fonts for better email client compatibility
  2. Use inline styles for maximum email client support
  3. Keep images under 600px width for better mobile viewing
  4. Test your emails across different email clients
  5. Use padding instead of margin when possible
  6. Include a text version for every image (alt text)
  7. Keep the total email width under 600px
  8. Use web-safe colors

Email Client Compatibility

The components are built with email client compatibility in mind and include specific optimizations for:

  • Gmail
  • Apple Mail
  • Outlook
  • Yahoo Mail
  • Other major email clients

The components automatically handle:

  • MSO (Microsoft Outlook) conditional comments
  • Email-safe CSS properties
  • Responsive design considerations
  • Font fallbacks
  • Image handling

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