Alright, I'm answering my own question. I changed mail to mailAlternateAddress here:
zmprov
prov> mcf -zimbraGalLdapAttrMap zimbraMailDeliveryAddress,zimbraMailAlias,mail=ema il,email2,email3,email4,email5,email6
prov> mcf +zimbraGalLdapAttrMap zimbraMailDeliveryAddress,zimbraMailAlias,mailAlte rnateAddress=email,email2,email3,email4,email5,ema il6 |