Remove Schemer's username from that
Also, have you shared the inbox folder 'public'? Tough that 'external & public' ability is removed on mailfolders in the ZWC in more recent builds to cut down on confusion (I don't know your version). So you'd have to have to use CLI zmmailbox modifyFolderGrant, an existing auth token, or call:
https:// INSERTUSERNAMEHERE:INSERTPASSWORDHERE@server.domai n.com/service/user/INSERTUSERNAMEHERE/inbox.rss
Zmmailbox - Zimbra :: Wiki
http:// server.domain.com/zimbra/home/username/Inbox.atom
http:// server.domain.com/zimbra/home/username/Inbox.rss
http:// server.domain.com/zimbra/home/username/inbox?fmt=rss&query="in:inbox is:unread"
-'user' & 'home', as well as 'service' & 'zimbra' are mostly interchangable
-Depending upon if you're already logged in/permissione etc, you can replace accountnames with ~ to view your own.
-Some are often not needed & you can construct in a variety of ways. ie:
/user/~
/home/accountnamehere
/zimbra/user/~/
/zimbra/home/~/
/zimbra/user/accountnamehere/
/zimbra/home/accountnameehere/
/service/home/~
SRC\ZimbraServer\docs\rest.txt is also handy for tidbits of information.