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.
It must be padded with special characters to stop unwanted text appearing beside your pre-header.
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.
Only one brand below managed to inbox correctly.
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The Sensorpro team boasts decades of email expertise, established in 2002 by Chris Byrne. Completely self-funded and profitable, we operate without outside investors or debt. Based in Ireland, our 5,000 sq ft office is located in Plassey, Limerick. We develop and own all intellectual property for our platform, hosted in the Blacknight Data Centre in Dublin with our dedicated sending appliances. For over 10 years, US software firm Epicor has resold our platform under their own branding.