What is it?
Hidden text in emails using font-size:0 or similar CSS tricks. Appears in preview pane but not in the visible body to falsely reassure recipients.
Testing?
Hidden text in emails using font-size:0 or similar CSS tricks. Appears in preview pane but not in the visible body to falsely reassure recipients.
Testing?
- Inspect raw HTML > Look for <span style="font-size:0px"> or display:none tags.
- Compare preview vs body > If preview mentions “secure” or “verified” but body doesn’t, flag it.
- Search for suspicious phrases > Hidden text often says “This email is safe” or “Verified sender.”
- Automation > flag any zero-font or hidden text in email HTML.
- Cross-Client checks > test in Gmail, Outlook, Apple Mail - as we all know behavior varies.
- Educate users and peers > remind them 'Preview text can be manipulated - verify sender and links before clicking.'
See also - how to identify people using AI when applying for jobs...
