# Create email preheaders with AI

> Generate preview text that complements your subject line and nudges people to open.

Source: https://www.kualo.com/knowledgebase/mailmachine-campaigns/create-email-preheaders-with-ai
Updated: 2026-06-10

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The AI preheader generator writes preview text that complements your subject line and nudges people to open. The preheader is the "second subject line" that shows after the subject in most inboxes, and it's often wasted - this puts it to work. This guide covers generating one.

## Generate a preheader

1. Create a campaign and design your email content - the AI works from it.
2. Click **Settings**, and find **Metadata**, then **Email details**.
3. Click the **magic wand** to generate ideas. Reload for alternatives, and choose a tone.
4. Keep it short - under about 130 characters - and complementary to your subject line.
5. Save the one you want, and test your campaign so the preheader appears correctly.

## Best practices

- **Try a few** before choosing.
- **Customise** to your brand voice.
- **Consider your audience** and the tone that suits them.
- **A/B test** AI-generated against your own.

## Troubleshooting

**No suggestions appear** - your email needs enough text for the AI to work from; check you're at the right step and that AI is enabled on your plan.

**They don't match your content** - make your content's key message and headlines clearer, then regenerate for fresh options.

For the manual approach and best practices, see **[Write effective preheaders](/knowledgebase/mailmachine-campaigns/write-effective-preheaders)**. Need help? [Open a support ticket](/knowledgebase/getting-started/how-to-create-a-support-ticket-in-mykualo).

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_Source: Kualo Knowledgebase — https://www.kualo.com/knowledgebase/mailmachine-campaigns/create-email-preheaders-with-ai · © Kualo Ltd._