Zoho Campaigns enforces character limits and restricts certain special characters on several campaign fields, to keep your campaigns compatible across email clients and deliverability systems.
Character limits and restricted characters
| Field | Restricted characters | Character limit |
|---|
| Campaign Name | ` ~ # ^ * [ ] {'{'} {'}'} \ " ; & < > % | 150 |
| Subject | ; \ | 200 |
| Pre-header | ` ; ^ \ < > " | 200 |
| Sender Name | ` ~ ! # ^ * [ ] {'{'} {'}'} \ " ; $ % < > + = ? | 150 |
HTML template limit
Separately, the maximum size for an HTML email template is 300,000 characters.
Note: If a restricted character is used in one of these fields, Zoho Campaigns will typically flag it or strip it, so it's worth reviewing campaign names and subject lines for these characters before scheduling a send, particularly if you've copied text from another source that may include special punctuation like smart quotes or em dashes.
Need help? 1 Cloud Consultants can help you troubleshoot campaign validation errors and design templates that stay within Zoho Campaigns' limits.
Book a discovery call with 1 Cloud Consultants.