使用MJML构建的提醒邮件在AOL邮箱显示空白，求排查原因

Hey there, let's break down why those legacy AOL users are getting blank emails even though your Win10/Firefox test checks out. Here are the most probable reasons:

• Outdated Browser/OS Rendering Limits
  Windows Vista reached end-of-life back in 2017, and the latest Firefox version that supports it is 52 (also discontinued). MJML generates modern HTML/CSS that relies on features like flexbox, which these ancient browsers don't understand. Even AOL's email client running on this outdated setup can't parse the MJML-generated code correctly, resulting in a blank display.

• Legacy AOL Client Quirks
  The AOL email client on Vista/Firefox is a legacy variant with strict limitations that modern MJML might not account for:

  • CSS Inlining Issues: While MJML inlines CSS by default, some old AOL clients block or misinterpret certain inline styles.
  • HTML Structure Restrictions: Older clients struggle with nested divs or modern semantic tags that MJML outputs.
  • Image Blocking: If your email uses external images, legacy AOL often blocks them by default. Without proper fallback text, this leaves nothing visible.

• MJML Version Compatibility
  Newer MJML versions might use CSS/HTML constructs that weren't optimized for legacy email clients. If you recently updated MJML, rolling back to a slightly older version with better legacy support could resolve the blank email issue.

• Missing Plain-Text Fallback
  MJML supports responsive design, but if you didn't enable plain-text fallback generation, legacy clients that can't render the HTML version will show nothing. Always include a plain-text alternative—AOL's older clients often default to this when HTML fails.

Quick Troubleshooting Tips #

• Test using a virtual machine running Windows Vista and Firefox 52 to replicate the issue firsthand.
• Use MJML's built-in validation tools to flag code that might break in legacy clients.
• Ensure you're sending both HTML and plain-text versions of your email.

内容的提问来源于stack exchange，提问作者SILENT