I'm Getting a 'Too Much Mail Data' Error

Understanding email size limits and how to resolve this error.

This error triggers when an email surpasses the maximum allowable size for your subscription level, preventing forwarding or delivery while maintaining system performance.

Size Limits by Tier

  • Free accounts: 10MB maximum
  • Premium/Enterprise: 50MB maximum

Common Causes

Emails can exceed limits due to:

  • Large file attachments (images, documents, videos)
  • Embedded rich media content
  • Extended email threads with multiple replies and attachments

Recommended Solutions

For Free Tier Users

  1. Compress files before attaching using available online tools
  2. Use cloud storage — Upload large files to Google Drive, Dropbox, or similar services and share links instead of attachments
  3. Consider upgrading to the Premium tier for increased limits and additional benefits

Where You'll See This Error

Users typically encounter this notification in the Non-Delivery Report (NDR) or bounceback message from the sender. It also appears in your ImprovMX dashboard logs.

Still have questions? Feel free to reach out to our support team!