

If your test email fails with a popup error, it’s usually a formatting issue. Here’s how to fix custom values and validate the test email address so your campaign tests send successfully.
You may try to send a test email and run into an error, even though your campaign looks correct.
Most test email failures come from small formatting issues, especially with custom values or invalid email inputs.
Without catching these early, the same issues can affect your live campaigns.
This guide will show you how to troubleshoot test email errors so you can fix problems quickly and send with confidence.
Once you understand the common causes, follow the steps below to correct formatting issues, validate inputs, and successfully test your emails inside your BizStackPro account.
When you click Send Test (or similar) inside an email campaign/template, you might see a popup like:
“An error occurred, please try again.”
Good news: This is usually fixable in a couple minutes—most often it’s a custom value bracket issue.
{{contact.name}} | {{contact.city}}
{contact.name} | {{{contact.name}}}
[email protected]).
Follow along: If you copied text from another tool/editor, quickly scan for “smart braces” or any odd formatting around custom values—then resend the test.
BizStackPro combines email, automations, and CRM tools—so you can build campaigns once and reuse the same proven setup across your workflows.
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Most often it’s an invalid custom value format or an incorrectly formatted test email address. Fix brackets and validate the address, then resend.
Use double curly brackets like {{contact.name}}. Avoid {} or {{{}}}.
Check the “How to Send a Test Email and SMS” guide for best practices around testing and formatting.
Fixing custom value formatting now prevents campaign failures later. Run a clean test, confirm links and personalization, then schedule your send.
Fewer errors. Better sends.
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