Custom Address in GAL
Zimbra by default will show all aliases associated with an account. The following will cause Zimbra to only display the “Canonical Address”.
zmprov mcf -zimbraGalLdapAttrMap zimbraMailDeliveryAddress,zimbraMailAlias,mail=email,email2,email3,email4,email5,email6,email7,email8,email9,email10,email11,email12,email13,email14,email15,email16 zmprov mcf +zimbraGalLdapAttrMap zimbraMailCanonicalAddress,mail=email zmprov fc config
This may vary depending on your Zimbra install