Overview
Testing your emails before launch helps catch mistakes, ensure good deliverability, and improve engagement. Use this guide to test efficiently and follow industry best practices.
Sending Test Emails
Before going live:
Click Send Test Email to preview layout, links, and personalisation
Test on multiple devices (desktop & mobile) and email clients (Gmail, Outlook, Apple Mail)
Best Practice Testing Checklist
Check all links and buttons
Confirm dynamic tags like
{{first_name}}display correctlyReview mobile vs desktop formatting
Preview in Dark Mode and Outlook (both behave uniquely)
Run your email through a Spam Test tool
Validate your sender email is authenticated (SPF, DKIM)
Make sure unsubscribes and suppression rules work
Improving Delivery & Engagement
Use clear subject lines (try the AI Title Assistant tool)
Avoid ALL CAPS or excessive punctuation
Limit the number of large images
Include a text version of the email
Warm up new sender domains before sending large volumes
Bounce Rate & Open Rate Tips
Hard Bounce = Invalid address
Soft Bounce = Temporary issue
Clean your lists regularly and segment by engagement
Rules for Blocking Invalid URLs in Messages
To maintain security, reliability, and consistency, certain types of URLs, email addresses, and telephone links are blocked in messages. Below are the key categories and examples of invalid formats that are not allowed.
Key Blocking Rules
Block URLs with spaces (unless properly encoded as
%20).Block URLs without a valid protocol.
Block multiple or malformed protocols.
Block FTP and data URLs.
Block URLs with invalid characters or encodings.
Block malformed hosts (dot-only, ending with dot, no TLD, invalid IP/punycode).
Block emails with invalid formats (
@errors, dots, Unicode, display names, missing domain).Block telephone links with non-numeric content.
Industry Tips
Use test segments before mass sends
Use Google Postmaster Tools for diagnostics
Avoid spammy language and overly promotional headers
Add relevant personalisation to increase open