Email preview display of emails sent may be different depending the emailing application used to read the email. Some applications display email content to preview email while others may display the code.
This is the case for example of Outlook which displays the source code in the email as first email previsualization.
Sometimes the message preview can display the spy pixel code integrated by Splio. This behavior may give a negative feeling to the end-user but most of all some critical elements may be hidden.
Regarding this issue, there is a workaround by changing the spy pixel position and placing them further down in the content.
To insert this variable in your message :