I used to receive from this plugin all email alerts (e.g. about new versions of other plugins, etc). Not anymore. Any pointers what to do?
If that helps, I also stopped receiving emails from the "Fast Secure Contact Form" plugin ( http://wordpress.org/plugins/si-contact-form/ ); however I solved that problem by following directions in http://www.fastsecurecontactform.com/email-does-not-send (i.e., set the “Return-path address (recommended)” field to an email address in my blog's domain, and checked the "Enable ONLY when web host requires “Mail From” strictly tied to site.(optional, rarely needed)" box).
Wordfence Security plugin doesn't have any advanced email setups to tinker with...