Zerc is a Chrome add-on developed by erwin.jubeau that allows users to quickly check if an email address is present in the list of recipients in Zimbra's modern version. This handy tool provides a simple and efficient way to verify email recipients without the need for extensive manual searching.

With Zerc, users can easily determine if a specific email address is included in the recipient list of an email on Zimbra. This can be particularly useful for quickly confirming whether an email has been sent to a particular recipient or group of recipients.

Zerc is a free add-on and falls under the category of Browsers, specifically Add-ons & Tools. It is a valuable tool for Zimbra users who frequently need to check email recipients and want a fast and convenient way to do so.