Introduction
Email images often fail due to size, format, or spam filters. This guide helps improve deliverability.
Common issues
- Attachments exceed provider size limits.
- Modern formats are not previewed by some clients.
- Too many heavy images trigger spam risk.
Optimization checklist
- Keep single image around or below 200KB when possible.
- Prefer JPG or PNG for compatibility.
- Keep image count reasonable.
- Use cloud links for many high-resolution images.
Recommended dimensions
| Placement | Size | File size |
|---|---|---|
| Email banner | 600 x 200 | 50-100KB |
| Embedded product image | 300 x 300 | 30-50KB |
| Attachment product image | 800 x 800 | 100-150KB |
| Signature logo | 150 x 50 | 10-20KB |