General troubleshooting
A plain-text warning keeps appearing
Elite support2 min readThe quick answer
Plain-text messages cannot carry an HTML tracking image. Turn off tracking for the plain-text message or switch to rich text and open a fresh compose window before testing again.
Use a compatible message format
Check compose mode
Open the inbox compose menu and check whether Plain text mode is selected. An open-tracking image requires a rich-text/HTML message.
Choose the intended behavior
Use rich text if you want a tracking image and rewritten HTML links. Keep plain text and disable tracking for that message when plain text is your requirement.
Start a fresh message
After changing the format, open a new compose window and check the controls before sending.
Verify separately
Use a separate mailbox and check the event classification. Plain text cannot be made pixel-trackable by installing another browser extension.
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