Add Proxy Allowed Domains to a Zimlet When deploying a Zimlet, the COS attributes, zimbraProxyAllowedDomains, must be set for the domain address that the Zimlet might call to get information. 1. To set this attribute, type: zmprov mc <COSname> +zimbraProxyAllowedDomains <*.domain.com> The * must be added before the domain.com. This must be applied to all COSs that have your Zimlet enabled.