What is a preheader (or preview text)?
The preheader (or preview text) is a short line of text that is shown in the email client before the user opens an email. The preview text is separate from the subject line.
The preview text is only displayed in certain email clients:
| Provider | Preheader shown? | Correct display in newsletter? |
| gmail.com |
Yes | Yes |
| yahoo |
Yes | Yes |
| AOL | No | Yes |
| freenet | No | Yes |
| outlook.com | No | Yes |
| t-online | Yes | Yes |
| thunderbird | No | Yes |
| Anroid | Yes | Yes |
| iOS | Yes | Yes |
Learn more about preheaders here.