Vmail screenshot

Vmail

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Updated: 17 Jan 2026
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VMail - check the markup (HTML, CSS) of HTML email template compatibility with email clients

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Overview

VMail is a tool that allows users to check the markup (HTML, CSS) of HTML email templates for compatibility with different email clients. Email clients often have different rendering standards, causing emails to appear different than intended. VMail helps identify problematic elements and provides a list of email clients that may lack support or only partially support certain HTML and CSS rules. It collects data on support for specific rules from Caniemail.com.

Features

  • Validation: VMail validates the markup (HTML, CSS) of HTML email templates to ensure compatibility with various email clients.
  • Problematic Element Identification: It identifies and lists specific elements in the email template that may cause rendering issues in certain email clients.
  • Support Information: VMail provides information on the level of support for certain HTML and CSS rules by different email clients, sourced from Caniemail.com.

Installation

To use VMail in development mode, follow these steps:

  1. Install Ruby, Node.js, and Golang.
  2. Run the following commands in the terminal:
    • Build wasm files from Go files.
    • Format svelte components.
    • Benchmark parser.

Summary

VMail is a tool that helps users ensure that their HTML email templates are compatible with different email clients. It identifies and provides information on problematic elements that may cause rendering issues. By collecting data on HTML and CSS rule support from Caniemail.com, VMail helps users create more consistent and visually appealing email campaigns.