Who wouldn't want that?
It shows on mobile devices just below the subject line. On some desktop clients like Gmail, it can show to the right of the subject line, depending on display settings.
Used carefully, it can mean the difference between an email open and not.
According to Litmus it must be padded with special characters to stop unwanted text appearing beside your pre-header.
Use the tool below to pad your pre-header, then copy into your pre-header block in the Sensorpro designer. Other platforms have a similar approach.
PS Most mobile devices will show 32 letters or less, so keep the visible text under 32 if you can.
Type pre-header text, then click Pad.
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