{both written by David H. Kaye, Distinguished Professor of Law at Penn State)
If you are not sure if a publisher is legitimate or predatory, be on the watch for the following red flags:
Online digital publishing has allowed new publishers that use questionable practices to thrive. These so-called predatory publishers solicit articles from faculty through spam email. Their goal is to exploit faculty need to publisher in exchange for an article processing fee (APC), which is used by legitimate open access publishers as a way to fund the publication.
TACTICS include:
Criteria for Determining Predatory Open-Access Publishers (Infographics from the University of West Indies, which you can also access the PDF version of full texts for). Thank you to Rutgers Libraries.
Adapted from an article from Nature.