Salut,
I have a problem on 5.0.11!
I have a first domain "domain.com" and an alias "alias.domain.com".
I use the zmprov commands for create this :

zmprov cd alias.domain.com zimbraDomainType alias zimbraMailCatchAllAddress @alias.domain.com zimbraMailCatchAllForwardingAddress @domain.com
Mail routing ok:
user@domain.com receive a mail from
user@alias.domain.com
Problem :

In WebUI the recipient who appear is
user@alias.domain.com instead of
user@domain.com
Thanks.