Most email systems these days allow you to edit the pre-header text which appears in the email preview line on mail systems (rather than just showing the first few works of the email which is what encharge does). You can definitely improve open rates with good preheader text.

The usual implementation is to start the email with a 1px high, 0 transparency line with the preheader text in it - so it's seen in the email preview but not in the email itself.